You might get a better answer if you were to pose this question in the “Google Assistant and Sonos” area , under the “Voice Control and Smart Home” area of the forum. 

Or perhaps a mod would be willing to move this thread there? It’s also possible that it’s been posed and answered in that area, too. 

I was searching for the same myself and read on a reddit sub that Google and Sonos used to have a partnership and they played well together until Sonos sued Google for patent infringement. It doesn’t look to me like they will ever come together again. 

https://www.wsj.com/articles/sonos-scores-legal-win-in-patent-battle-with-google-11628887424

Terry