Hi @user.at.large, welcome to the Sonos Community!
I’d recommend turning on Night Mode on the system, this can help alleviate the jump in volume between TV shows and commercials.
Sonos will play what it’s being given by the TV and doesn’t recognize show from commercial. I’m not sure how possible it would be with our current hardware as looking up ZVOX, this feature seems to use a specific processor to handle the audio leveling.
Our community members may have other suggestions, such as third party devices you could use, but this isn’t a feature we have. However I've marked this thread as a feature request and it will be seen by the relevant teams for consideration.
Ok, Thanks, I will hope for a Beam 3.