No interaction built in for this kind of simplified use-case, it's just like one of the old "template engines" of the old day, just in JSX/TSX. It's actually much better than expected, I used to dislike that all the old templates had something "off" for me; either they invented their own syntax for logic that you needed to learn besides normal JS (think Handlebars, Pug, etc), or they were in JS-like and with an odd HTML syntax that made sharing between plain HTML and whichever language very hard (think Pug/Jade).

With JSX templating, it's a subset of React, so you can directly share "up"t, and sharing "down" is very easy as well (just removing interaction), since both use the same syntax.