How Do You Pick Up After Your Dog In a Wheelchair?
With the poop bag around my dominant hand, I lock my wheels and use my other hand to grip either the frame of my chair near the front or the rim of my tire. Then, I very slowly lean over until my hand reaches the ground. You never want to rush bending over like this because you want to give yourself enough time to sit back up if you realize your chair isn't on stable ground.
If bending over is too difficult for you, you could always buy a small scooper or grabber.