Как объединить Microcharts и Json в Xamarin?

MainPage.xaml

 <StackLayout>

    <forms:ChartView x:Name="Chart4"  
                         HeightRequest="150"/>
 </StackLayout>

RateInfo.cs

    public class Confirmed
{
    public int value { get; set; }
    public string detail { get; set; }
}

RateViewModel.cs

       public class RateViewModel : INotifyPropertyChanged
{

    private int value_c;

    /// ///////////////////confirmed///////////////////////////////
     public int Value_c
    {
        get { return value_c; }
        private set
        {
            this.value_c = value;
            OnPropertyChanged("Value_c");
        }

    }

    /// ///////////////////LoadDataCommand///////////////////////////////
    public ICommand LoadDataCommand { protected set; get; }

    public RateViewModel()
    {
        this.LoadDataCommand = new Command(LoadData);
        LoadData();
    }


    public async void LoadData()
    {
        string url = "";

        try
        {
            HttpClient client = new HttpClient();
            client.BaseAddress = new Uri(url);
            var response = await client.GetAsync(client.BaseAddress);
            response.EnsureSuccessStatusCode(); // выброс исключения, если произошла ошибка

            // десериализация ответа в формате json
            var content = await response.Content.ReadAsStringAsync();
            JObject o = JObject.Parse(content);

            var str = o.SelectToken(@"$.confirmed");
            var rateConfirmed = JsonConvert.DeserializeObject<Confirmed>(str.ToString());

            this.Value_c = rateConfirmed.value;

        }
        catch (Exception)
        { }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    public void OnPropertyChanged(string prop = "")
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(prop));
    }
   }
  }