Shared jinja macros?

I use quite a few macros that I share across each template definition, is there any easy way to pool this into one single resource that is loaded on boot?

(I’m assuming not and that each template is locked down for some security reason, or some such…)

Jinja has import support: I actually tried to use this last week, but it simply doesn’t work. I’m not sure why, but I’m guessing that Home Assistant doesn’t allow it for some reason.

Maybe someone else can point us in the right direction, because I would love to know as well.