When you ask for something that is streamed right back from assistant api and not from an app like Spotify you don't have control on Sonos va app but only the option to ask Google assistant to stop.
Substantially when the playback of something like "hei google tell me the news" you'll notice the status of the player from the app or the exposed API as "nothing in play".
Missing the option to stop it via any other external API but pressing the physical buttons or asking for "ok Google stop".
For speech impaired and movement impaired people this is frustrating.
Could you please add a status like "assistant engaged" and a stop button on API and APP?
As the playing status is already there this shouldn't be too hard to implement.