Yes you have to export a displacement map, and then render with metal ray to get the high subdivision model.
You cant work with that poly count right now. And dont even think in binding that.
In z-plugin's tab you have MULTI DiSPLACEMENT, there you export the displacement map, but you have to do other stuff first, like creating a morph target to comeback to the original low poly object then go to that option MULTI DISPLACEMENT and then exporting the displacement.