[Enhancement]: Combine eBooks and Audiobooks from different folders in the same library

Type of Enhancement

Web Interface/Frontend

Describe the Feature/Enhancement

I would love it if I could point to two separate folders for my library, one with audiobooks and one with ebooks, then have those folders combine into the same item in the frontend. I don't want to store my eBooks and Audiobooks in the same folder, but I do want them to appear together in audiobookshelf. For now, I solve this by adding symlinks on my NAS so the eBooks appear in the Audiobook's folder. But it'd be awesome if this could be supported natively.

The major issue here is matching books together. What if some of my books only have eBooks? What if they get matched incorrectly? Perhaps there could be a metadata field that links them together? Or a matching interface where you help audiobookshelf know that two separate items are actually the same item.

Why would this be helpful?

I want to store my eBooks and Audiobooks in different folders, but have them appear as a combined item in audiobookshelf.

Future Implementation (Screenshot)

Audiobookshelf Server Version

v2.10.1