Will this work? Hyperion server, Hyperion Android Grabber on Note9 phone grabbing from phone camera?

I will soon get a spare Note9 phone since the battery is dvindeling.
Behind my TV I have a 300 RGBW WLED setup.
In order to be able to get ambilight from TV Apps (Samsung) I understand a camera is needed.
Filming the TV screen with the phone produces a nice sharp flicker-free image on the phone screen.
Putting the phone on USB power, will this camera setup work well with Hyperion(-NG)?
Will the phone screen light level affect the grabbing?
Just wanted to check if this approach is at all feasible.