Hi @Joe Scheck,
Unfortunately, JSON passthrough support isn't possible with the zosConnect-2.0 (OAS2) runtime.
The good news is that the zosConnect-3.0 (OAS3) runtime can support JSON passthrough by using JSONata to handle the payload. We're just about to ship a sample API project that shows how to do it and, once that sample is published on GitHub, I'll post again here with the link.
Kind Regards,
Mark