After trying to see how it performs on a 1000 page book, I'm back to thinking this would be better as an application on your start 9. Still thinking it's better as a DVM (if you run your own its still private). You could have a chaim of dvms that you run, 1 to convert PDFs and such to eBook or whatever format you want,

1 to convert it to audio in whatever dialect you want. Maybe 1 for translation and another for adding the chapters.

Otherwise you can just build your standard bookmarking or note taking app like Obsidian I think?

Idk, I see the use case, but it's in general is for hands free stuff so it'd be really weird to want to use it on anything shorter than 2 pages?