I can definitely help figure stuff out and show you how to do PCB design if that interests you.
Figuring out the scope of the project and any unanswered questions before you start can save you a lot of effort though. Check out this thread for a similar proposal by @Leeborg and you can check out some of the considerations we went over.
If you place the power transfer coil over top of the implant, it will cover it up. If you make the power transfer coil larger than the implant so it doesn’t cover it up, you still need to have a wearable in the same spot. You mine as well just have a light up wearable.
You could try and figure out how to transfer power over a greater distance of like 20cm, but you’re going to need a large coil and a large battery to have enough power available. It might be a bit bulky. Also making sure the coil shape and orientation is correct to transfer with power from the transmitter is a bit of a hurdle. A flat coil under the skin is going to face outward. You may need a cylindrical coil, but it needs to remain pointing towards the center of the transmitter or it won’t receive any power.