diff --git a/src/ert/config/ert_config.py b/src/ert/config/ert_config.py
index 8495ff2f48c..deef1a1d90a 100644
--- a/src/ert/config/ert_config.py
+++ b/src/ert/config/ert_config.py
@@ -221,33 +221,6 @@ def handle_default(fm_step: ForwardModelStep, arg: str) -> str:
     }
 
 
-def forward_model_data_to_json(
-    substitutions: Substitutions,
-    forward_model_steps: list[ForwardModelStep],
-    env_vars: dict[str, str],
-    env_pr_fm_step: dict[str, dict[str, Any]] | None = None,
-    user_config_file: str | None = "",
-    run_id: str | None = None,
-    iens: int = 0,
-    itr: int = 0,
-    context_env: dict[str, str] | None = None,
-):
-    if context_env is None:
-        context_env = {}
-    if env_pr_fm_step is None:
-        env_pr_fm_step = {}
-    return create_forward_model_json(
-        context=substitutions,
-        forward_model_steps=forward_model_steps,
-        user_config_file=user_config_file,
-        env_vars={**env_vars, **context_env},
-        env_pr_fm_step=env_pr_fm_step,
-        run_id=run_id,
-        iens=iens,
-        itr=itr,
-    )
-
-
 @dataclass
 class ErtConfig:
     DEFAULT_ENSPATH: ClassVar[str] = "storage"
diff --git a/src/ert/enkf_main.py b/src/ert/enkf_main.py
index bf5fce54b81..1e6aeb33823 100644
--- a/src/ert/enkf_main.py
+++ b/src/ert/enkf_main.py
@@ -14,7 +14,7 @@
 import xarray as xr
 from numpy.random import SeedSequence
 
-from ert.config.ert_config import forward_model_data_to_json
+from ert.config.ert_config import create_forward_model_json
 from ert.config.forward_model_step import ForwardModelStep
 from ert.config.model_config import ModelConfig
 from ert.substitutions import Substitutions, substitute_runpath_name
@@ -272,16 +272,15 @@ def create_run_path(
             path = run_path / "jobs.json"
             _backup_if_existing(path)
 
-            forward_model_output = forward_model_data_to_json(
-                substitutions=substitutions,
+            forward_model_output: dict[str, Any] = create_forward_model_json(
+                context=substitutions,
                 forward_model_steps=forward_model_steps,
                 user_config_file=user_config_file,
-                env_vars=env_vars,
+                env_vars={**env_vars, **context_env},
                 env_pr_fm_step=env_pr_fm_step,
                 run_id=run_arg.run_id,
                 iens=run_arg.iens,
                 itr=ensemble.iteration,
-                context_env=context_env,
             )
             with open(run_path / "jobs.json", mode="wb") as fptr:
                 fptr.write(
diff --git a/tests/ert/unit_tests/config/test_forward_model_data_to_json.py b/tests/ert/unit_tests/config/test_create_forward_model_json.py
similarity index 95%
rename from tests/ert/unit_tests/config/test_forward_model_data_to_json.py
rename to tests/ert/unit_tests/config/test_create_forward_model_json.py
index 83f98c9499e..31102b27927 100644
--- a/tests/ert/unit_tests/config/test_forward_model_data_to_json.py
+++ b/tests/ert/unit_tests/config/test_create_forward_model_json.py
@@ -10,7 +10,7 @@
 from ert.config import ErtConfig, ForwardModelStep
 from ert.config.ert_config import (
     _forward_model_step_from_config_file,
-    forward_model_data_to_json,
+    create_forward_model_json,
 )
 from ert.substitutions import Substitutions
 
@@ -295,8 +295,8 @@ def test_config_path_and_file(context):
         substitutions=context,
         user_config_file="path_to_config_file/config.ert",
     )
-    steps_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    steps_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -318,8 +318,8 @@ def test_no_steps(context):
         user_config_file="path_to_config_file/config.ert",
     )
 
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -339,8 +339,8 @@ def test_one_step(fm_step_list, context):
             substitutions=context,
         )
 
-        data = forward_model_data_to_json(
-            substitutions=ert_config.substitutions,
+        data = create_forward_model_json(
+            context=ert_config.substitutions,
             forward_model_steps=ert_config.forward_model_steps,
             env_vars=ert_config.env_vars,
             user_config_file=ert_config.user_config_file,
@@ -357,8 +357,8 @@ def run_all(fm_steplist, context):
         substitutions=context,
     )
 
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -400,8 +400,8 @@ def test_that_values_with_brackets_are_ommitted(caplog, fm_step_list, context):
         forward_model_steps=forward_model_list, substitutions=context
     )
 
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -558,8 +558,8 @@ def test_forward_model_job(job, forward_model, expected_args):
 
     forward_model = ert_config.forward_model_steps
 
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -589,8 +589,8 @@ def test_that_config_path_is_the_directory_of_the_main_ert_config():
         fout.write("FORWARD_MODEL job_name")
 
     ert_config = ErtConfig.from_file("config_file.ert")
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -661,8 +661,8 @@ def test_simulation_job(job, forward_model, expected_args):
         fout.write(forward_model)
 
     ert_config = ErtConfig.from_file("config_file.ert")
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -696,8 +696,8 @@ def test_that_private_over_global_args_gives_logging_message(caplog):
         fout.write("FORWARD_MODEL job_name(<ARG>=B)")
 
     ert_config = ErtConfig.from_file("config_file.ert")
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -735,8 +735,8 @@ def test_that_private_over_global_args_does_not_give_logging_message_for_argpass
         fout.write("FORWARD_MODEL job_name(<ARG>=<ARG>)")
 
     ert_config = ErtConfig.from_file("config_file.ert")
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -786,8 +786,8 @@ def test_that_environment_variables_are_set_in_forward_model(
         fout.write(forward_model)
 
     ert_config = ErtConfig.from_file("config_file.ert")
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -817,8 +817,8 @@ def test_that_executables_in_path_are_not_made_realpath(tmp_path):
     )
 
     ert_config = ErtConfig.from_file(str(config_file))
-    data = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    data = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
diff --git a/tests/ert/unit_tests/config/test_ert_config.py b/tests/ert/unit_tests/config/test_ert_config.py
index da5709049a3..2ed61d4f857 100644
--- a/tests/ert/unit_tests/config/test_ert_config.py
+++ b/tests/ert/unit_tests/config/test_ert_config.py
@@ -17,7 +17,7 @@
 
 from ert.config import AnalysisConfig, ConfigValidationError, ErtConfig, HookRuntime
 from ert.config.ert_config import (
-    forward_model_data_to_json,
+    create_forward_model_json,
     site_config_location,
 )
 from ert.config.parsing import ConfigKeys, ConfigWarning
@@ -857,11 +857,12 @@ def test_fm_step_config_via_plugin_ends_up_json_data(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert step_json["jobList"][0]["environment"]["FOO"] == "bar"
 
@@ -885,12 +886,14 @@ def test_fm_step_config_via_plugin_does_not_leak_to_other_step(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
+
     assert "FOO" not in step_json["jobList"][0]["environment"]
 
 
@@ -913,12 +916,14 @@ def test_fm_step_config_via_plugin_has_key_names_uppercased(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
+
     assert step_json["jobList"][0]["environment"]["FOO"] == "bar"
 
 
@@ -941,11 +946,12 @@ def test_fm_step_config_via_plugin_stringifies_python_objects(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert step_json["jobList"][0]["environment"]["FOO"] == "{'a_dict_as_value': 1}"
 
@@ -972,11 +978,12 @@ def test_fm_step_config_via_plugin_ignores_conflict_with_setenv(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert step_json["global_environment"]["FOO"] == "bar_from_setenv"
     assert step_json["jobList"][0]["environment"]["FOO"] == "bar_from_plugin"
@@ -1002,11 +1009,12 @@ def test_fm_step_config_via_plugin_does_not_override_default_env(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert (
         step_json["jobList"][0]["environment"]["_ERT_RUNPATH"]
@@ -1034,11 +1042,12 @@ def test_fm_step_config_via_plugin_is_substituted_for_defines(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert step_json["jobList"][0]["environment"]["FOO"] == "define_works"
 
@@ -1062,11 +1071,12 @@ def test_fm_step_config_via_plugin_is_dropped_if_not_define_exists(monkeypatch):
         encoding="utf-8",
     )
     ert_config = ErtConfig.with_plugins().from_file("config.ert")
-    step_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    step_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         env_pr_fm_step=ert_config.env_pr_fm_step,
+        run_id=None,
     )
     assert "FOO" not in step_json["jobList"][0]["environment"]
 
@@ -1533,13 +1543,13 @@ def test_validate_no_logs_when_overwriting_with_same_value(caplog):
 
     with caplog.at_level(logging.INFO):
         ert_config = ErtConfig.from_file("config_file.ert")
-        forward_model_data_to_json(
-            substitutions=ert_config.substitutions,
+        create_forward_model_json(
+            context=ert_config.substitutions,
             forward_model_steps=ert_config.forward_model_steps,
             env_vars=ert_config.env_vars,
             user_config_file=ert_config.user_config_file,
             run_id="0",
-            iens="0",
+            iens=0,
             itr=0,
         )
 
diff --git a/tests/ert/unit_tests/config/test_forward_model.py b/tests/ert/unit_tests/config/test_forward_model.py
index b2afc1fca5f..849a86c8362 100644
--- a/tests/ert/unit_tests/config/test_forward_model.py
+++ b/tests/ert/unit_tests/config/test_forward_model.py
@@ -13,7 +13,7 @@
 from ert.config import ConfigValidationError, ConfigWarning, ErtConfig
 from ert.config.ert_config import (
     _forward_model_step_from_config_file,
-    forward_model_data_to_json,
+    create_forward_model_json,
 )
 from ert.config.forward_model_step import (
     ForwardModelStepJSON,
@@ -503,11 +503,12 @@ def test_that_forward_model_substitution_does_not_warn_about_reaching_max_iterat
 
     ert_config = ErtConfig.with_plugins().from_file(test_config_file_name)
     with caplog.at_level(logging.WARNING):
-        forward_model_data_to_json(
-            substitutions=ert_config.substitutions,
+        create_forward_model_json(
+            context=ert_config.substitutions,
             forward_model_steps=ert_config.forward_model_steps,
             env_vars=ert_config.env_vars,
             user_config_file=ert_config.user_config_file,
+            run_id=None,
             iens=0,
             itr=0,
         )
@@ -721,8 +722,8 @@ def validate_pre_realization_run(
             getattr(first_fm, a) == v
         ), f"Expected fm[{a}] to be {v} but was {getattr(first_fm,a)}"
 
-    fm_json = forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    fm_json = create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -776,8 +777,8 @@ def validate_pre_realization_run(
     with pytest.raises(
         ConfigValidationError, match="Validation failed for forward model step"
     ):
-        forward_model_data_to_json(
-            substitutions=ert_config.substitutions,
+        create_forward_model_json(
+            context=ert_config.substitutions,
             forward_model_steps=ert_config.forward_model_steps,
             env_vars=ert_config.env_vars,
             user_config_file=ert_config.user_config_file,
@@ -819,8 +820,8 @@ def validate_pre_realization_run(
 
     first_fm.validate_pre_realization_run({"argList": ["never"]})
 
-    forward_model_data_to_json(
-        substitutions=ert_config.substitutions,
+    create_forward_model_json(
+        context=ert_config.substitutions,
         forward_model_steps=ert_config.forward_model_steps,
         env_vars=ert_config.env_vars,
         user_config_file=ert_config.user_config_file,
@@ -883,8 +884,8 @@ def validate_pre_realization_run(
         ConfigValidationError,
         match=".*This is a bad forward model step, dont use it.*",
     ):
-        forward_model_data_to_json(
-            substitutions=config.substitutions,
+        create_forward_model_json(
+            context=config.substitutions,
             forward_model_steps=config.forward_model_steps,
             env_vars=config.env_vars,
             user_config_file=config.user_config_file,
diff --git a/tests/ert/unit_tests/forward_model_runner/test_forward_model_runner.py b/tests/ert/unit_tests/forward_model_runner/test_forward_model_runner.py
index 4fcdcca033b..5fc64f75e4e 100644
--- a/tests/ert/unit_tests/forward_model_runner/test_forward_model_runner.py
+++ b/tests/ert/unit_tests/forward_model_runner/test_forward_model_runner.py
@@ -11,7 +11,7 @@
 from ert.config import ErtConfig, ForwardModelStep
 from ert.config.ert_config import (
     _forward_model_step_from_config_file,
-    forward_model_data_to_json,
+    create_forward_model_json,
 )
 from ert.substitutions import Substitutions
 
@@ -235,8 +235,8 @@ def test_exec_env():
     with open("jobs.json", mode="w", encoding="utf-8") as fptr:
         ert_config = ErtConfig(forward_model_steps=[forward_model])
         json.dump(
-            forward_model_data_to_json(
-                substitutions=ert_config.substitutions,
+            create_forward_model_json(
+                context=ert_config.substitutions,
                 forward_model_steps=ert_config.forward_model_steps,
                 env_vars=ert_config.env_vars,
                 user_config_file=ert_config.user_config_file,
@@ -276,8 +276,8 @@ def test_env_var_available_inside_step_context():
     with open("jobs.json", mode="w", encoding="utf-8") as fptr:
         ert_config = ErtConfig(forward_model_steps=[step])
         json.dump(
-            forward_model_data_to_json(
-                substitutions=ert_config.substitutions,
+            create_forward_model_json(
+                context=ert_config.substitutions,
                 forward_model_steps=ert_config.forward_model_steps,
                 env_vars=ert_config.env_vars,
                 user_config_file=ert_config.user_config_file,
@@ -326,8 +326,8 @@ def test_default_env_variables_available_inside_fm_step_context():
             substitutions=Substitutions({"<RUNPATH>": "./"}),
         )
         json.dump(
-            forward_model_data_to_json(
-                substitutions=ert_config.substitutions,
+            create_forward_model_json(
+                context=ert_config.substitutions,
                 forward_model_steps=ert_config.forward_model_steps,
                 env_vars=ert_config.env_vars,
                 user_config_file=ert_config.user_config_file,