Changing speech output to Sonos speakers

I’ve got MyCroft up and running on a Raspberry Pi 3. Its going nicely and I was even able to integrate it to turning my Hue lights on and off. But what I’d really like is to have the MyCroft speech output go to my Sonos speakers I have throughout the house.

I’ve found the project SoCo (https://github.com/SoCo/SoCo). And one of the code examples is as follows

sonos.play_uri(
http://1.1.1.1/test.mp3’)

Is there a way to change the default speech output like this?

I am also interested in making this happen, but I am not sure how to…
Did you find out anything about this?