is there a setting in yaml or some config that can enable SSH instead of gRPC?

[morethanlessoo7]

I've encounter the gRPC problems periodically, I just want to change back to gRPC but the document says you should set an ENV variable. I don't like to set ENV, so, it there an alternative method to set to SSH?

[AkihiroSuda]

I've encounter the gRPC problems periodically

What problems?

is there a setting in yaml or some config that can enable SSH instead of gRPC?

No.
We had a PR, but we didn't merge it:

• Implement "Dual" port forwarder (SSH for TCP, GRPC for UDP) #4210

portForwardTypes:
  tcp: ssh
  udp: grpc