I'm a fan of coating wheels, but not a fan of spending $50+ on a "wheel" specific ceramic coating. Once I'm done coating the car, I hit the (clean) wheels with the applicator and even without adding more serum, it'll still impart protection to the wheels. Any leftover from the little 30 or 50ml bottle could be used to redo the wheels 6 months (or whatever) later.
If not coating the car, and specifically wanting to just do the wheels, it might be smart to buy a product like Cancoat partly due to ease, but also so that you can apply it multiple times as I assume a coating on wheels will degrade much faster than on body paint.
I personally have something very similar to Cancoat, WG's uber ceramic spray, and I'll use that to boost my wheel's coating (left over pure evo) when I notice the wheels no longer beading so aggressively (I decon the wheels every wash). Then I'll wait till I coat the car again (in 2024), and do the wheels again then.
I'll add one more suggestion if you don't wish to buy a wheel coating specific product. You could buy a little (400ml-500ml) bottle of Gyeon Wetcoat or Carpro Hydro and hit the wheels at the end of your wash, as needed.