Does react support django template engine?

Question

Django

And is it possible to merge the backend and frontend without a REST API?

Answer 1

Does react support django template engine?

The Django template engine runs on the backend, React on the frontend. They work at different times, on different machines, "communicate" using standard protocols invented long before the advent of Django, React and even JS, they don't know anything about each other, and therefore they don't interfere with each other.
In theory, yes, but in practice, it's pointless.

Answer 2

Your first question has been answered above.
On the second - yes - for example using websocket's