And even OK Google open "App" On TV. Will this be possible with third party apps or Google needs to do it?
And even OK Google open "App" On TV. Will this be possible with third party apps or Google needs to do it?
This feature is extremely hardware dependent. So, no, not possible unless the OEM wills it.
AFAIK the closest u can get is having the atv remote app installed, saying "OK Google open remote" and then pressing home to turn the TV on, if u have cec enabled
It can be done but not via TV alone. You need the Smart Remote app and then you need to set it up. The app itself has OK Google support for controlling devices. So "OK Google [name of TV remote] power on" would turn on your tv.