group_gr_roles.routing.yml

# Group role entity routes.
entity.group_gr_role.collection:
  path: '/group/{group}/roles'
  defaults:
    _entity_list: 'group_gr_role'
    _title: 'Group roles'
  requirements:
    _permission: 'administer group'

entity.group_gr_role.add_form:
  path: '/group/{group}/roles/add'
  defaults:
    _controller: '\Drupal\group_gr_roles\Entity\Controller\GroupGrRoleController::add'
    _title_callback: '\Drupal\group_gr_roles\Entity\Controller\GroupGrRoleController::addPageTitle'
  requirements:
    _permission: 'administer group'

entity.group_gr_role.permissions_form:
  path: '/group/{group}/permissions'
  defaults:
    _form: '\Drupal\group_gr_roles\Form\GroupPermissionsGroupSpecificForm'
    _title: 'Edit group permissions'
  requirements:
    _permission: 'administer group'

entity.group_gr_role.edit_form:
  path: '/group/{group}/roles/manage/{group_gr_role}'
  defaults:
    _entity_form: 'group_gr_role.edit'
  requirements:
    _permission: 'administer group'

entity.group_gr_role.delete_form:
  path: '/group/{group}/roles/delete/{group_gr_role}'
  defaults:
    _entity_form: 'group_gr_role.delete'
    _title: 'Delete'
  requirements:
    _entity_access: 'group_gr_role.delete'

#entity.group_gr_role.permissions_form:
#  path: '/group/{group}/roles/{group_og_role}/permissions'
#  defaults:
#    _form: '\Drupal\group\Form\GroupPermissionsRoleSpecificForm'
#    _title: 'Edit group role permissions'
#  requirements:
#    _permission: 'administer group'
#  options:
#      parameters:
#        group_type:
#          type: 'entity:group_type'