Json десериализация TimeOnly

Dictionary<TimeOnly, List<string>>

Public class TimeOnlyJsonConverter: JsonConverter<TimeOnly>
{
    private const string Format ="HH:mm:ss.FFFFFFF";
    public override TimeOnly ReadJson(JsonReader reader,Type objectType, TimeOnly existingValue, bool hasExistingValue, JsonSerializer serialiser)
       => TimeOnly.ParseExact((string)reader.Value, Format, CultureInfo.InvariantCulture);
    public override void WriteJson(JsonWriter writer, TimeOnly value, JsonSerializer serializer)
      => writer.WriteValue(value.ToString(Format, CultureIngo.InvariantCulture));
}

Dic=JsonConvert.DeserializeObject<Dictionary<TimeOnly, List<string >>>(File.ReadAllText(path), new TimeOnlyJsonConverter);

Dic.add(new TimeOnly(10 , 30, 00), new List {"aaa"; "bbb"});

        TimeOnly t1 = new(10, 30, 15), t2 = new(10, 30, 55), t3 = new(10, 30, 15);
        Console.WriteLine(t1 == t2);
        Console.WriteLine(t1 == t3);

using System;
using System.Globalization;
using System.Collections.Generic;
using Newtonsoft.Json;
                    
public class Program
{
    public static void Main()
    {
        Dictionary<TimeOnly, string> dict = new()
        {
            { new TimeOnly(10, 30, 20), "aaa" },
            { new TimeOnly(10, 40, 35), "bbb" }
        };
        var json = JsonConvert.SerializeObject(dict);
        Console.WriteLine(json);
        
        var dict2 = JsonConvert.DeserializeObject<Dictionary<TimeOnly, string>>(json);      
        foreach (var kv in dict2)
        {
            Console.WriteLine("{0:hh\\:mm\\:ss}: {1}", kv.Key, kv.Value);
        }
    }
}

using Newtonsoft.Json;
 
using System;
using System.IO;
using System.Text;
using System.Windows.Forms;
 
namespace TimeToJson
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            string json = JsonConvert.SerializeObject(DateTime.Now.ToString("dd.MM.yyyy HH:mm"), Formatting.Indented);
            File.WriteAllText(@"D:\dt.json", json, Encoding.UTF8);
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            string jsondata = File.ReadAllText(@"D:\dt.json", Encoding.UTF8);
            DateTime dt = JsonConvert.DeserializeObject<DateTime>(jsondata);
            MessageBox.Show(dt.ToString("dd.MM.yyyy HH:mm"));
        }
    }
}