Asciidoctor has a web PDF tool that just went alpha a little bit ago, uses the same stack as the OP's thingie.

https://github.com/Mogztter/asciidoctor-web-pdf

The content handoff goes like this: Asciidoc (using defined roles) generates HTML5 (Pagedjs polyfills page areas / pagination stuff), CSS styles stuff, and Puppeteer runs a headless Chromium for the pdf render. It's straight from CSS GCPM W3C spec, a flavor of CSS Paged Media, drafts that have been percolating since frickin' 2006 but have never seen browser implementation.

The beauty of this is that you use the same CSS for web and PDF deliverables. Actually, the even better beauty is that you are using two dirt-common technology stacks - CSS and Javascript - instead of XSL or Prawn or some ancient bespoke layout language. With Asciidoctor, for complex print requirements you're going to be forced to either 1) DocBook-XSL via fopub or 2) DocBook-LaTeX via dblatex. The native Prawn-based PDF tool isn't capable of a whole lot of customization without extensions. So web-pdf is a real shot in the arm for those of us that aren't real keen on going back into XSL-FO.