Simple Alexa Solution To Turn TV On and Off

I have an LG OLED I use as a monitor. The ThinQ app has alexa integration so I can turn it on and off with voice but ideally, I’d like the TV to turn on I walk into the office and off when I’m not there for a several minutes .

It would need to be sensitive enough not to turn off while I’m sitting at my desk working.

Would a Kasa Motion Sensor Light be sensitive enough to see small movements from my chair and could I create something with alexa where if light is on, turn TV on and if light is off, turn TV off?