[Chimera-users] Generating a single electrostatic potential surface for a protein + ligand complex

Hi, New user to ChimeraX here, would really appreciate some help! I'm trying to generate an electrostatic potential surface for a protein-ligand complex. Currently, I am using the surface/coulombic, and surface ligand/coulombic ligand commands to generate surfaces separately for the protein and ligand, and then exporting to an .obj file. However, by doing so I'm left with two separate surface meshes, and what I really want is a single surface that encapsulates both entities. Is it possible to do this? Thanks in advance!