Need advice on setting up a Virtual Audio Device on MacBook Pro

I have a MacBook Pro running Sequoia 15.6.1. I need to play an audio file directly from Apple Music on my Mac to FaceTime. I Think that I need to set up a Virtual Audio Device and then use that as Output.

How do I do that? What software do I need? I don't need anything elaborate.

Thank You!

RayTheVillager