Feature Request: different surround levels for spatial audio vs stereo

When listening to atmos content via Apple Music, I feel the need to turn up the surround music slider. It is then too loud on the surrounds when a traditional stereo track comes on. I have the surrounds set to full. 
 

I’d like there to be separate volume sliders for Spatial Audio surrounds and stereo audio surrounds, just like tv vs music, but a subcategory within music.