using System;

using System.ComponentModel.DataAnnotations;

using System.Text;

using System.Text.Encodings.Web;

using System.Text.Json;

using System.Text.Json.Serialization;

public class Program

{

    public record MyType

    {

        [Required]

        public string? Help { get; init; }

        public override string ToString()

        {

            var ss = new StringBuilder();

            ss.AppendLine($"Help = {Help ?? "I'm null"}");

            return ss.ToString();

        }

    }

    public static void Main()

    {

        var testJson = """

            {

                "Help": null

            }

        """;

        var result = JsonSerializer.Deserialize<MyType>(testJson, Options());

        Console.WriteLine(".NET object:");

        Console.WriteLine(result);

        var backToJson = JsonSerializer.Serialize(result, Options());

        Console.WriteLine();

        Console.WriteLine("Json:");

        Console.WriteLine(backToJson);

    }

    private static JsonSerializerOptions Options()

    {

        // Simulate the same options as we use for DIP 

        return new JsonSerializerOptions(JsonSerializerDefaults.Web)

        {

            WriteIndented = true,

            PropertyNameCaseInsensitive = true,

            Converters = { new JsonStringEnumConverter() },

            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,

        };

    }

}