As noted many times in the Atmos thread(s), it would be nice if Apple would make "Atmos" and "Dolby Audio" something you could search for, filter on, etc. I still wish I could make a smart playlist in Apple Music for macOS that just shows all my Atmos content. The data is in the file itself, like so many other tags, they just don't make it something you can use to filter a smart playlist.