Material Handling in a USD file

Dear Community,

I have a USD file showing all the materials for the different assets correctly. I want to choose the base color image from a PBR out of the different metallic/roughness… It seems the export functionality in Isaacsim from usd to .fbx is already doing something similar. I would to know if this is actually possible: go over the different texture images provided to a mesh and be able to pick only the basecolor (I want to do that through python scripting)

Thank you for your help