Have you tried Bookwyrm? It’s also available self-hosted, if you want to ignore or limit the social media part.

Someone else said, Openreads is a good, entirely local, app, with CSV in/export, and written in Flutter so you should be able to run it on your desktop, too.

Or, if you read e-books and don’t want the social media part, use Calibre. My only issue is that it doesn’t sync all of the information my Kobo obviously tracks, like read times and star-rating.