Mrinmoy Bharadwaj
Ansys Employee

You can try using HFSS 3D Layout for importing Gerber files. However, a gerber file is just like a stencil and does not contain stack-up or via information. I suggest, if you can source the odb++ or the IPC2581 format of your PCB from the designer, you would be spending much less time in just getting the PCB ready.