[protobuf] How to define a map option?

[Googol Lee]

I want to make a map option to rpc. I try the code below.

message Ext {
  map<string, string> query = 1;
}

extend google.protobuf.MethodOptions {
  Ext ext = 10000;
}

service S {
  rpc method(In) returns (Out) {
    option (ext) = {
      query: {
        "key": "value",
      }
    };
  }
}
```

But when I run protoc, it replys 'Error while parsing option value for 
"ext": Expected identifier, got: "key"'.

I tried many ways to set query map value, but all failed. Is there a way to 
do that? How?

Thank you.

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