I need some help with a complex json about x2struct HOT 2 CLOSED

struct From {
  int id;
  bool is_bot;
  string first_name;
  string username;
  XTOSTRUCT( O(id, is_bot,first_name,username));
};

struct Chat{
  int id;
  string first_name;
  string last_name;
  string username;
  string type;
  XTOSTRUCT( O(id, first_name,last_name,username,type));
};

struct Result {
  int message_id;
  From from;
  Chat chat;
  int  date;
  string text;
  XTOSTRUCT(O(message_id, from, chat, date, text));
};

struct retour {
  bool ok;
  Result result;
  XTOSTRUCT(O(ok, result));
};