telegram-bot/CustomChatAddOns/Data/NewMessage.cs

using Kruzya.TelegramBot.Core.Attributes;
using Newtonsoft.Json;
using Telegram.Bot.Types;

namespace Kruzya.TelegramBot.CustomChatAddOns.Data
{
    [AllowedSerializableType("new_message")]
    public class NewMessage
    {
        [JsonProperty("message")]
        public Message Message { get; set; }
    }
}