It took me a bit of digging but Framework sells a single port 240w USB-C charger https://frame.work/au/en/products/power-adapter-240w?v=FRAKM...

That said I would not trust this as a PSU for a computer which uses almost all the available power output and does not have it's own internal battery. Most USB-C chargers are not designed to run at 100% capacity for extended periods and could not handle sudden spikes over the rated capacity. Even for desktop PSUs you always want to get something that has a good headroom over the actual power draw for stability.