I haven't tried it myself but this is the Sony page about Alexa control:
https://www.sony.co.uk/electronics/s...icles/00186768
You could do it via a Logitech Harmony controller for any TV:
https://www.tomsguide.com/us/connect...view-3465.html
Harmony doesn't have the greatest reputation for stabilty though.
AVForums is always a good source: here's a serch for "Alexa control TV":
https://www.avforums.com/search/7862...tv&o=relevance