Import and use model with blendshapes from maya to ue4?

I have made a model with blendshapes in maya, but no skeletons. How could I import and use its blendshapes in ue4?

I have several scanned poses of a human face and I have made the blend shapes with maya and trying to export as fbx file and use it in ue4. but I have no skeletons what so ever so it doesn’t work.

any suggestions on how to properly import and use my model and its blendshapes?

((btw it’s not for gaming purpose and I just want to make a widget uI to show transform between shapes with a slider))