using System;

using System.Collections.Generic;

using System.Collections.Immutable;

using System.Text.Json;

using System.Text.Json.Serialization;

​

public record A 

{

    [JsonInclude] 

    public string Name { get; private set;}

    public string Type { get; init;}

    [JsonInclude] 

    public string Category { get; }

    [JsonInclude] 

    public B Class { get; private set; }

}

​

public record B 

{

    [JsonInclude] 

    public string Name { get; private set;}

    public string Type { get; init;}

    [JsonInclude] 

    public string Category { get; }  

}

​

public static class Program

{

    public static void Main()

    {

        var a = JsonSerializer.Deserialize<A>("""

                                            {

                                                "Name": "a-name",

                                                "Type": "a-type",

                                                "Category": "a-category",

                                                "Class": {

                                                   "Name": "b-name",

                                                   "Type": "b-type",

                                                   "Category": "b-category"

                                                }

                                            }

                                            """

        );

        Console.WriteLine($"{a}");

    }

}