How to enable Jinja2 editor in non-Flask project with IntelliJ Ultimate+Python plugin?

Hi,
I'd like to use the Jinja2 editor in my Python project, which was not created as Flask project.
How can I enable it for my templates directory?
It is not listed as a choice in Preferences/Template Data Languages.

The Jinja2 editor is working properly in a Flask project.


Thanks!
Miguel