Yes, if they are somewhat general. And, it is a great way to have me maintain template compatibility for you in case something changes in a future version.
[It isn’t really a question, but it has come up a couple of times.]
The use of Jinja seems to be an entry barrier to some people, but it isn’t going to change. For the same – invariably pointless and religious – reasons people prefer other templating engines I prefer Jinja.
With all that said, I probably wouldn’t be opposed to accepting patches supporting additional optional engines ;)