trying to convert mysql rows to json array

`auto usersQuery = dbClient->execSqlAsyncFuture("SELECT id,name from users");

try{
auto users = usersQuery.get();
**//how to convert users (drogon::orm::Result) to json::Value array ?**
auto resp=HttpResponse::newHttpJsonResponse(ret);
callback(resp);
return;
}
catch (const drogon::orm::DrogonDbException &e)
{
std::cerr << "gameinfo error:" << e.base().what() << std::endl;
}`