How to get Apple Music to stop playing when Siri reads a message?

I have Auditory Processing Disorder and cannot understand speech when there are background distractions. When I am driving and I receive a text message, Siri will slightly lower the volume of my music to read the message, but I need the music to STOP. I literally cannot understand what Siri is saying with the background music.

I can't find a setting for this, in the Accessibility section or elsewhere. How does one suggest such an option?