如何根据C#中的型号数动态构造JSON key名称？

using Newtonsoft.Json;
using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        int modelNumber = 123; // 型号数

        Dictionary<string, object> json = new Dictionary<string, object>();

        string keyName = $"model_{modelNumber}_name";
        string keyValue = "Example Value";

        json.Add(keyName, keyValue);

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