Audio Roles, Volumes and Routes

What if you want to have your phone’s alarm clock volume different from your music playback volume and have the later go to speakers while alarms should continue to go to the phone’s speaker? While this could be handled manually via per application volume and sink setups, this doesn’t scale well on phones that also have emergency alerts, incoming calls, voice assistants, etc. It also doesn’t specify how to handle simultaneous playback - for instance, if an incoming call rings while music is playing.