Hey there ATom,
I apologize about the late response on this, thank you for being patient! Were you able to figure out the CEC capabilities of the Chromecast? If not, I'd be happy to help out, since I know things can be pretty tricky to find information online about the subject. It seems like you can only turn on and off the TV, change the volume of the Chromecast, and use the Google Assistant to control those settings as well. You can also cast from several streaming services like Netflix, Disney+, Hulu, etc. You can also pause playback, resume, skip around by the minute. As for controlling other connected devices, it does not look like the Chromecast is able to do so at this point in time.
I hope that helps, and if you have any other questions or concerns for me, please let me know.
Since this thread hasn't had activity in a while, we're going to close it to keep content fresh.
We hope you were able to get the help you need from the info provided by Jeran. If you have other questions and concerns, feel free to submit another post and provide as many details as possible so that others can lend a hand.
Thanks for the help here, Jeran.