Wattage on chargers is a capacity, not a spec of what comes out of it regardless of the load. Even older "dumb" chargers only deliver as much power to a load as it will draw on it's own.
Newer DJI products use a protocol called Power Delivery, where the charger and the load are both "smart", communicate with each other and negotiate a power profile. So the load knows what the charger can do, and asks for no more.
When selecting a PD charger the important spec is overall power capacity, maximum power per port, and power per port When multiple ports are in use.
That said, my advice to people is to bite the bullet and invest $80-100 bucks in a good 200W multiport that can do 100W simultaneously on two ports. It will be all you need for many devices for a long time. You can charge drone batteries,
goggles, and RCs all at once.
I have this one,
U$69 at Amazon. The display is a nice feature...
Has a very flexible multiport power distribution: