While you are aiming to LaTeX as your engine, for completeness for Typst, here are some bookish templates:
Pandoc also uses tempates for all its output formats, so for Typst you create a custom pandoc-template that references the typst pre-made template, and this gets imported for you. For example to get wonderous-book, add #import "@preview/wonderous-book:0.1.2": book to the start of your pandoc template, then use pandoc metadata to fill in the fields. In fact i have some scrivener test projects available for book templates with Typst here and following posts:
You can see the actual Typst generated from Scrivener via Pandoc and resulting PDF live here (in this case I downloaded min-book as a file and include it rather than link to it online):
The great thing is you can tweak the Typst and see the changes live, when you ar happy, copy it back to your Pandoc template and voila.