I’m a little bit confused… How does this differ from your previous thread?
Because, as I said there, if you can use Alexa to launch a specific show by voice, then there is a method for putting that into a smartthings routine, so that you can start the process from a virtual switch.
But I don’t know if that specific tv model can use Alexa to launch individual shows or not.
Since I put a lot of details into the other thread, I’m not going to repeat all of that here, but look at the responses there, and see if they help at all.