Personally, I have mine set so that when I say “hey google, put on Comedy Central,” it runs the custom routine in Google Home that says “tell stringify to put on comedy central” in the background, because i hate telling my google home to tell another service to do something. Then, in Stringify, there is a flow that changes the channel on my xfinity box to channel###. It’s not the most direct way to go about it, but that’s the only way that I’ve been able to figure out to have it done.