Display ReplayGain metadata if exists?

In the “Details” dropdown from three dots of the song or maybe album.
(Or maybe a simple icon somewhere, different icon if has song, album, or both gain)
And well another idea, not sure if implementable or really neccesary, but say it is playing via foobar uPnP, send command to scan the album or song?
Just some ideas, would not say “request” really.