Autorig Pro and blendshapes (morphs)

Hello!
I am suppose to do animation and rigging work for some game but I am very limited with bone count so I cannot use Auto Rig pro face rig. I was thinking about adding morphs to mesh to add any sort of facial expression but I after I export it no morphs can be seen at skeletal mesh panel in Unreal. Any idea what to do ? I was making it working once in unity but I was doing my own rig and not Auto Rig Pro. So eventually I will just rig it by hand and maybe then it will work out.

Cheers!