Audio ducking - Use a layer instead of a source

Is there a way to trigger audio ducking with another layer, not just a single media source file? I just did a show where I had a playlist of background music that I wanted to duck whenever a pre-recorded announcement was triggered. I had all my announcements as variants in another layer named “VOs”
Currently you can’t choose a layer as the Trigger Source for Ducking, just a single source file, so only one of my announcements would actually “duck” the music.