Seems this just released 10 hours. Was mentioned in this other thread, but figured it was worth granting it's own topic. Very Cool! I'm not the dev, but this is awesome. Was originally posted to Reddit here.

Oh wow, repo is https://github.com/LLukas22/Jellyswarrm

Jellyswarrm is a reverse proxy that lets you combine multiple Jellyfin servers into one place. If you’ve got libraries spread across different locations or just want everything together, Jellyswarrm makes it easy to access all your media from a single interface.

Working

• Unified Library Access – Browse media from multiple Jellyfin servers in one place.
• Direct Playback – Play content straight from the original server without extra overhead.
• User Mapping – Link accounts across servers for a consistent user experience.
• API Compatibility – Appears as a normal Jellyfin server, so existing apps and tools still work.

⚠️ In Progress

• Websocket Support – Needed for real-time features like SyncPlay (not fully reliable yet).
• Audio Streaming – May not function correctly (still untested in many cases).
• Automatic Bitrate Adjustment – Stream quality based on network conditions isn’t supported yet.

🚫 Not Planned

• Admin Functions – Server administration (user management, settings, etc.) won’t be supported through Jellyswarrm.----