There aren’t any that I can find that support >100w, but this adapter from slimq is pretty much what you’re after. DC to USB PD3.0 Charging Hub – SlimQ Official Store
It takes the 12v 240w from a gaming brick and gives you 2 100w PD ports. So once higher wattage versions come around you’d be set. Having one in hand, it is way too big to ever fit in an expansion port.