Django added Jinja2 as a built-in template backend some versions ago. The Django ecosystem hasn't really caught up to supporting it with reusable templates yet though.
Yeah I mentioned that. I don't think it can ever really work the way it's implemented right now. I think the only way it can work is slowly transitioning the Django template language to be syntactically similar to Jinja, that will give a progressive transition path. But it's a ton of work.
