The cross app search is ace. I've sideloaded Kodi which is great at indexing my media server content, pulling in artwork and maintaining which movies/tv shows I watched, and even the positons.
So it would be perfect for the two to talk to each other, which they don't right now. Is this just a pipe dream?
Someone said these info is only coming from online services and are maintained by Google. If that's the case it seems hard for content from Kodi, Emby, Plex etc to be available. Unfortunately. 😢