How to add blendshapes/morph targets to higher MetaHuman LODs in Maya

I’m using a heavily modified DNA head file with a custom mesh and custom joint locations. I’ve also removed all the LODs except for LOD_2, making that the new LOD_0. Metahuman’s blink animation isn’t closing my character’s eyelids all the way, so is there a way to add corrective eyelid blendshapes to the LOD_2 mesh and propogate that to the DNA? I want to make sure I don’t mess anything up in Unreal Engine.