these two tools apparently let you rip borrowed audiobooks from this service named libby. although i haven’t tested them. https://github.com/ping/odmpy https://github.com/bookbonobo/libby-download-extension

also, have you checked the index? stuff like this is usually there.

fyi, lemmy doesen’t have sublemmies, but communities. that’s why the url is instance/c/community or yourinstance/c/community@instance