using System;

public class Program

{

    public static void Main()

    {

        Person p = new Person {Id = 1, Name = "User1"};

        var myoptional = new Wrapper<Person>(p);

        Console.WriteLine(myoptional.ToString());

        Person p1 = new Person();

        myoptional = new Wrapper<Person>(p1);

        Console.WriteLine(myoptional.ToString());

        Person p2 = null;

        myoptional = new Wrapper<Person>(p2);

        Console.WriteLine(myoptional.ToString());

    }

}

​

public class Wrapper<T> where T: class {

    T mydata;

    public Wrapper(T data) {

        mydata = data;

    }

    public override string ToString(){

        var mycustomstruct = new {Wrapper = mydata};

        return System.Text.Json.JsonSerializer.Serialize(mycustomstruct);

    }

}

​

public class Person {

    public int Id {get;set;}

    public string Name {get;set;} = string.Empty;

}