7 hours ago
Unfortunately there's currently no way to view Extras in Kodi. There's an open feature request (that actually predates Jellyfin) but no one working on it that I can tell. If I can ever find time and figure out enough of both sides of the issue I might take a stab...but I've been saying that for 2 years so I wouldn't wait on me!
https://github.com/jellyfin/jellyfin-kodi/issues/787
https://github.com/jellyfin/jellyfin-kodi/issues/787