Quixel Bridge doesn't allow other texture maps to be used with UE4?

Whenever you use Quixel Bridge and try to export a surface, the download setting preset for UE4 shows the albedo, normal, displacement, and roughness maps and that's it. And whenever you do download it with a custom preset (including specular map or others) it seems as if those 4 textures are the only ones compatible, which really makes Bridge pointless to use for making more complex materials. Any way to change this to include other maps?