I use Allegorithmic’s b2m (bitmap to material). You can generate PBR maps (albedo, roughness/reflections, heightmap, normal, etc) from any texture you load in!
https://www.allegorithmic.com/products/bitmap2material
You can also check Nvidia tools plugin for photoshop (it’s free)
https://developer.nvidia.com/nvidia-texture-tools-adobe-photoshop