How do you with a var in tera with rocket_dyn_templates

[RAPrograms]

I am currently trying to pass a var into an include statment but I keep encountering an error is there anyway to pass it without an error?

Error:

Error: Failed to initialize Tera templating.
   >> Failed to parse "/path/app/static/templates/pages/signup/index-full.html.tera"
   >>   --> 12:16
   |
12 |     {% include filename %}
   |                ^---
   |
   = expected a string or an array of strings
   >> Template initialization failed. Aborting launch.
Error: Rocket failed to launch due to failing fairings:

This is my template

{% extends "layouts/authentication" %}

{% block head%}
    <link rel="stylesheet" href="/styles/authentication/services.css">
    <link rel="stylesheet" href="/styles/forms/forms.css">
    <script src="https://unpkg.com/[email protected]"></script>
    <script src="https://unpkg.com/[email protected]/dist/ext/sse.js"></script>
    <script src="/scripts/main.js"></script>
{% endblock %}

{% block body %}
    {% include filename %}
{% endblock %}

Route Code

TemplateOrRedirect::Template(Template::render("pages/signup/index-full", context!{
        filename: "index".to_string(),
        subscription_pence_price: subscription_price["unit_amount"].as_f64(),
        subscription_interval: subscription_price["recurring"]["interval"].as_str()
    }))

[the10thWiz]

You can't. Includes must be a string literal. See: https://keats.github.io/tera/docs/#include