By using this method https://gist.github.com/Ademking/e9141c8336de77c3ea1c390dc666bfaa I've recorded which button is the "PICTURE_OFF" on my remote that simply turns off the screen on Bravia TV and then triggered this from command line.
I could not find any programmatic way to turn off the display of Sony Bravia TV that I could for example script in Home Assistant.
I was thinking that maybe somewhere there is an Android "Activity" which would trigger this via ssh but did not find any. In the end you can turn off Sony Bravia from the "Action Menu" that you can find in your remote (I think this menu is editable so maybe you have to add there this command but mine was there out of the box).