return json c# . net core sql

Question

I’m doing a test with a console application. In it I consult the database and would like to return a file json of the result.

It is possible to return the query json without instantiating the object? how can I do this?

I tried to convert the query return, but it didn’t work:

using (var connection = new SqlConnection("Server=4.4.4.4.;Database=aaaa;user id=aaaa;password=aaaaa"))
        {
            var cmd = new SqlCommand("SELECT * from depposvendas", connection);
            connection.Open();
            SqlDataReader reader = cmd.ExecuteReader();

    //Neste caso estou tentando converter com json.net para json o retorno do SqlDataReader
    //Sem ter que instanciar objeto
            string output = JsonConvert.SerializeObject(reader);
    Console.WriteLine("{0}",output);

        }