如何填充嵌套的json对象C#

using Newtonsoft.Json;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Address
{
    public string Street { get; set; }
    public string City { get; set; }
}

public class NestedJson
{
    public Person Person { get; set; }
    public Address Address { get; set; }
}

public class Program
{
    public static void Main()
    {
        var person = new Person
        {
            Name = "John",
            Age = 30
        };

        var address = new Address
        {
            Street = "123 Main St",
            City = "New York"
        };

        var nestedJson = new NestedJson
        {
            Person = person,
            Address = address
        };

        string json = JsonConvert.SerializeObject(nestedJson);
        Console.WriteLine(json);
    }
}