brake pedal brake light switch/wire

[Pop's Ram]

Spring is almost here, and it will soon be camping season. I tow my truck behind my RV, and would like to add a light that works off the brake pedal switch which operates the brake lights. The light will get mounted at the top of the windshield behind the rearview mirror so I can see it in my rear camera in the RV. This will light up every time the braking unit activates the brakes on the ruck while in tow. Does anyone have a wiring diagram or some pics as to where I can find the wire on the brake pedal? I've looked and can't find it. 2019 Ram Laramie.

Thanks in advance!!