How to customize the Foreground color for cells in a column based on the cell content?

public partial class ViewController : UIViewController
{
   SfDataGrid grid=new SfDataGrid();
   ViewModel viewmodel= new ViewModel();
   
   public override void ViewDidLoad ()
   {
      base.ViewDidLoad ();
      grid.ItemsSource=viewmodel.Info;
      //Creation of template column
      var textcolumn2 = new GridTextColumn 
      {        
         UserCellType = typeof(CustomCell), //Loading a custom cell into the template column
         MappingName = "Percentage",
      };
      grid.Columns.Add (textcolumn2);
      View.AddSubview (grid); 
   }  
   
   public override void ViewDidLayoutSubviews ()  
   {   
      this.grid.Frame = new CGRect (0, 20, View.Frame.Width, View.Frame.Height);
      base.ViewDidLayoutSubviews ();
   }
}

public class CustomCell:GridCell
{
   private UILabel label;
   
   public CustomCell ()
   {
      label = new UILabel ();
      this.AddSubview(label);
   }
   
   public override void LayoutSubviews ()
   {
      label.Frame =new CGRect(35,0,this.Frame.Width,this.Frame.Height) ;  
      label.Text =DataColumn.FormattedCellvalue;   
      if (label.Text != "" && Convert.ToInt32 (label.Text) < 50)
           label.TextColor = UIColor.Red;
      else
           label.TextColor = UIColor.Green;
           base.LayoutSubviews ();
   }
   
   protected override void UnLoad ()
   {
      this.RemoveFromSuperview ();
   }
}