using System;

using System.Text.Json;

public class Program

{

        public class Record{

            public object Content = ""; 

        }

    public static void Main()

    {

        var tweet = JsonSerializer.Deserialize("{\"Tweet\" : \"stuff\"}", typeof(object));

        var record = new Record(){

            Content = tweet 

        };

        var final = JsonSerializer.Serialize(record);

        Console.WriteLine(final);

    }

}