Exporting Blendshapes

Hello, So… We are doing our thesis in Unreal Engine and we are exporting all the animation from Maya. We are using the Advanced Skeleton5 for the rig, but we are having exporting the animation and the skeleton because the character has two more arms. Also, we can’t export the blendshapes for the face. The blendshapes were done in Zbrush and then we exported them to Maya. But we can’t get them on Unreal Engine too.
Is there a method to export these things? Please we really need help, we don’t want to change our render engine just because of the animation problem.