Complete support for Protobuf proto3 standard in grpc-transcode

[sar009]

We are using grpc-transcode plugin to interact with gRPC apis through HTTP and we are using protobuf proto3 standard. Our proto looks something like below

syntax = "proto3";
package sample.helloworld;

service HelloWorld {
  rpc PerformHelloWorld (Request) returns (Response) {}
}

message Request {}
message Response {
  string hello = 1 [json_name="my-hello"];
}

the response we are expecting is {"my-hello": "world"} but we are getting {"hello": "world"}. I went through the proto.lua file and didn't find that we are parsing the response into the field name as mentioned in json_name. I believe that's because the json_name standard implementation is missing in Apisix.
Please don't mind the title of this discussion I posted so since I am not sure what other Protobuf standards are missing.
For now Is there a workaround for now?

P.S. While browsing for a solution I found a Protobuf lua implementation at lua-protobuf I believe this would be helpful. Also Protobuf docs for json_name.