Depends on how deep you want to go. The pioneering work in this field is the "The multiscale coarse-graining method." series of papers kicked off by Noid. Who is still a person to pay attention to in this field.
I also believe the work of Frank Noe is someone to watch for in the ML potential space for proteins.
I also believe the work of Frank Noe is someone to watch for in the ML potential space for proteins.
I'm also always happy to talk about CG.