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Please provide as much information as possible. At least, this should include a description of your issue and steps to reproduce the problem. If possible please provide a summary of what steps or workarounds you have already tried, and any docs or articles you found (un)helpful.

Problem you have encountered: Cannot change json_name when validate schema.

What you expected to happen: Below schema pass validation and can create.

Steps to reproduce: validate schema

syntax = "proto3";

message Value {
  optional double distance1 = 1;
  optional double distance2 = 2;
  optional double distance_1 = 3 [json_name = "distance_1"];
  optional double distance_2 = 4 [json_name = "distance_2"];
}

Other information (workarounds you have tried, documentation consulted, etc):

https://protobuf.dev/programming-guides/proto3/#json