Like I mentioned in the main post, Kavita is out because it doesn’t do uploads or embed metadata, and the developer isn’t interested in changing that.

Koreader is great but it is a reading app, and it’s not great on android. I’m looking for a selfhosted library that can sync Koreader or similar.

Wow really? What ereaders does it page sync with?

EDIT: Oh my this could be promising.

EDIT: Jellyfin frustratingly doesn’t allow you to store eBooks, Audiobooks and Comics in the same folder like CWA.