How to update an existing data point in Xamarin.Forms Chart?

<chart:SfChart.Series>
       <chart:ColumnSeries x:Name="series" ItemsSource="{Binding Data}" 
                           XBindingPath="Value" YBindingPath="Size" 
                           ListenPropertyChange="True">
       </chart:ColumnSeries>
</chart:SfChart.Series>

public class ChartDataModel : INotifyPropertyChanged
{
    public ChartDataModel(double value, double size)
    {
        Value = value;
        Size = size;
    }
 
    private double value;
 
    public double Value
    {
        get { return value; }
        set
        {
            this.value = value;
            RaisePropertyChanged("Value");
        }
     }
 
     private double size;
 
     public double Size
     {
         get { return size; }
         set
         {
              size = value;
              RaisePropertyChanged("Size");
         }
      }
 
      public event PropertyChangedEventHandler PropertyChanged;
 
      void RaisePropertyChanged(string name)
      {
           if (PropertyChanged != null)
               PropertyChanged(this, new PropertyChangedEventArgs(name));
      }
}