List files NOT found in playlists?

[eobet]

Is this possible?

I recently made a mistake which removed a lot of files from my playlists, and since I last tried to reconstruct them, I sort of lost track of which files I hadn't added to any playlists yet.

I thought maybe the information would be in the "Report" feature, something like a "Found in X playlists" so I could see which songs were in 0 of them perhaps...

Or even perhaps more manual, just the ability to search for a song and see which playlists they are in?