I love that I can create blocks with ACF, because creating the editor UI with Gutenberg can be difficult. However, I’d like to program the frontend with JSX. Is it possible to create the template for an ACF block using JS/JSX instead of PHP?
Yes – it is possible with wp_localize_script. You can read more about it on Codex page: https://developer.wordpress.org/reference/functions/wp_localize_script/