No, it isn't. The way that Sonos speakers work is that you tell them where to go and get the "sound" from (I'm simplifying here, there are other situations that don't apply to a PLAY:1), and the software doesn't know how to get sound from your computer.
Now, the other situations. If you had a Sonos One speaker, and a Mac, you could conceivably send the computer's sound to the Sonos One using AirPlay 2. Or, you could add a Sonos device to your setup that has a line in, such as a PLAY:5, one of the CONNECT pair, or a Sonos Amp, all of which have analog inputs. Of course, each of those inputs have a 70ms delay associated with them, which could be troublesome if you're watching a video.
The simple fact is that Sonos speakers aren't designed to be computer speakers. You'd be much better off getting a real computer speaker to use.
Bruce