Importing Existing Enfusion Textures into GIMP

For those familiar with surface masks, this process will be straightforward. If not, I recommend watching this video: Surface Mask Tutorial.
Export the Surface Mask corresponding to the texture you want to modify.
Import this mask into GIMP. I recommend adding it as a new layer in the SVG image you previously imported, but there are other methods as well.
Modify the Mask:
The main task is to paint white over the areas of the surface mask layer that correspond to the SVG mask layer.
My approach:
On the SVG layer in GIMP, select all painted areas.
Switch to the surface mask layer.
Paint the selected areas white.
Export the Image as PNG: It’s highly recommended not to overwrite the original Enfusion mask, so you can revert changes if needed. Use a clear naming convention for your modified mask, e.g., 
Concrete01-mod1.png.