Just got off the phone with him. He cant remember the specifics of it, but did it with a Dremel, and 3 L-Shaped type brackets that will accept a screw, and 3 very flat faced upholstery screws. He never could find the L-Shaped brackets commercially, but he found some in a desk he was taking apart.
He Dremeled the wall, at a angle, until the Samsung Desk Charger would just sit flushly to the interior pocket wall. Used 3 of the L-Shaped brackets to hold it in place. Ran the USB cable to the USB out on the back of his radio for power. He also told me he went thru 3 pockets before he find the right placement for the charger. He then used a couple layers of folded over cotton to protect the face from the opposite wall, and to also hold the phone in the pocket.
He first built it for his Note8, and it continued working for his Note9, and Note10.
His only complaint was the Samsung Wireless Charger had a LED in it, that was always on. And with no phone on it, it kinda annoyed him. But he got over it.
He has no pictures, and cant get any either. That Hoe got stolen X-Mas 2020.
Edit: Damn Nannies
Edit#2: He couldnt remember if it was the left wall, or the right wall, he did this mod too.. So check your spacing!