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.

I wrote something like this too. If i need interaction, i did something with the onclicks so it just sends the function definition to the client and calls that. Its not as powerful as react but you can do basic stuff. Its good if your site is mostly static.