aw shucks. i am happy to take point on this- I have been on a crusade for this since I first saw shaders in fusion way back in the before time. I immediately knew we should be able to bring in assets from a 3D application intact with its surfacing.
the fight goes on. perhaps the new USD format might help bring that 15 year old dream to reality for Fusion.
so yeah! let's do this... i won't have reams of time for much myself but i can get something started.
I found that when you make shaders in substance, you can then export the maps in whatever resolution you want!
so i think i'll begin with the ones made for a recent project of mine. perhaps if others are using substance they can do the same thing because while Fusion cannot import PBR shaders from other applications, you can take all the maps out of substance and reassemble them into a shader with a cook torrence for example - and it'll match it quite nicely.
contact me off list and i'll start compiling...