In my experience, most reporting has to be done as printable PDF or it doesn't exist. There doesn't seem to be a good story for paginated media yet. In the past I've used polyfills for CSS pagination features to generate modestly well formatted PDF documents. Then you can either print it out from the browser or use a headless browser to do the same. Also there are modules on NPM for Latex-style typesetting.

This looks very promising, also with the inclusion of svelte. I'd have to see how well it integrates with Python and R, as far as I can see you'd need to export data from those to make it usable, which is probably easy as well.