All objects comming null when trying to fetch json data from API c# xamarin

I trying to fetch data from this api point: click here

All objects come null, and I don’t know why.

The response is 200 ok, but every object is null.

using System;
using System.Collections.Generic;
using System.Text;
    
namespace pizhevsoft.Models.API
{
    internal class Voltage_AMS_AHS
    {
        public string StationName { get; set; }

        public int StationNumber { get; set; }

        public double? dayHour { get; set; }

        public double? dayHour1 { get; set; }

        public double? dayHour2 { get; set; }

        public double? dayHour3 { get; set; }

        public double? dayHour4 { get; set; }

        public double? dayHour5 { get; set; }

        public double? dayHour6 { get; set; }

        public double? dayHour7 { get; set; }

        public double? dayHour8 { get; set; }

        public double? avarage { get; set; }
    }
}

Here I set getters and setters for the properties.

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using pizhevsoft.Models.API;
    
namespace pizhevsoft.Services
{
    internal class RestService_Voltage
    {
        HttpClient _client;

        public RestService_Voltage()
        {
            _client = new HttpClient();
        }

        public async Task<List<Voltage_AMS_AHS>> Get_Voltage_AMS_AHS(string query)
        {
            List<Voltage_AMS_AHS> Get_Voltage_AMS_AHS = new List<Voltage_AMS_AHS>();

            try
            {
                var response = await _client.GetAsync(query);
                if (response.IsSuccessStatusCode)
                {
                    var content = await response.Content.ReadAsStringAsync();
                    Get_Voltage_AMS_AHS = JsonConvert.DeserializeObject<List<Voltage_AMS_AHS>>(content);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("ttERROR {0}", ex.Message);
            }

            return Get_Voltage_AMS_AHS;
        }
    }
}

In this code I use httpClient to get data, and the content have 157 objects but all of these is null.
What do I need to do to see the data from API point ?

UPDATE:

When I trying to use System.Text.Json.Serialization library the objects is still null:

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

namespace pizhevsoft.Models.API
{
    internal class Voltage_AMS_AHS
    {
        [JsonPropertyName("Станция име")]
        public string StationName { get; set; }

    [JsonPropertyName("Номер")]
    public int StationNumber { get; set; }

    [JsonPropertyName("ден/час")]
    public double? dayHour { get; set; }

    [JsonPropertyName("ден/час1")]
    public double? dayHour1 { get; set; }

    [JsonPropertyName("ден/час2")]
    public double? dayHour2 { get; set; }

    [JsonPropertyName("ден/час3")]
    public double? dayHour3 { get; set; }

    [JsonPropertyName("ден/час4")]
    public double? dayHour4 { get; set; }

    [JsonPropertyName("ден/час5")]
    public double? dayHour5 { get; set; }

    [JsonPropertyName("ден/час6")]
    public double? dayHour6 { get; set; }

    [JsonPropertyName("ден/час7")]
    public double? dayHour7 { get; set; }

    [JsonPropertyName("ден/час8")]
    public double? dayHour8 { get; set; }

    [JsonPropertyName("средно")]
    public double? avarage { get; set; }
}
}

This is raw view when I use System.Text.Json.Serialization

When I trying with Newtonsoft.Json with [JsonProperty("Станция име")] the objects not coming ..