kafka-ui/documentation/compose/proto/values.proto

syntax = "proto3";
package test;

message MySpecificTopicValue {
    string f1 = 1;
    string f2 = 2;
}

message MyValue {
  int32 version = 1;
  string payload = 2;
  map<int32, string> intToStringMap = 3;
  map<string, MyValue> strToObjMap  = 4;
}