This is an alternative method to my previous tutorial on adding material elements to your model. The only real difference is this one is done specifically in the UE Editor. Fast, easy, and efficient!
https://dev.epicgames.com/community/learning/tutorials/2YL1/unreal-engine-5-how-to-add-material-elements-to-your-model-directly-in-ue5-no-blender-needed