Please don't respond with links to ALEXA commands - we are beyond the introductory level here. It seems the answer is no. HOWEVER, there are work-arounds. Ive posted this question before. Im providing the link to get you guys up to speed.
You'll notice the best answer is not an answer; just a link to ALEXA commands. So it seems that I came across the answer serendipitously, but I don't fully understand it yet. At first the TV would only turn on to the HDMI output associated with arc - the sonos beam input. I usually use the computer input... (HDMI 3)... It changed to HDMI input 2 on its own. How? Not sure... trying to figure it out, but wanted to put this out there as others are experiencing the same hick ups.