How to add image annotations to a node in WPF Diagram (SfDiagram) control?

<ResourceDictionary>
     <ResourceDictionary.MergedDictionaries>
          <!--Initialize Shapes-->
          <ResourceDictionary Source="/Syncfusion.SfDiagram.Wpf;component/Resources/BasicShapes.xaml" />
     </ResourceDictionary.MergedDictionaries>
 
     <!--annotation viewtemplate-->
     <DataTemplate x:Key="viewtemplate">
          <Border BorderBrush="Black" BorderThickness="1">
               <Image Source="{Binding Path=Content}" HorizontalAlignment="Center" VerticalAlignment="Center" Width="60" Height="60" Stretch="Fill" />
          </Border>
     </DataTemplate>
 
     <!--annotation edittemplate-->
     <DataTemplate x:Key="edittemplate">
          <Border BorderBrush="Black" BorderThickness="1">
               <Image Source="{Binding Path=Content}" HorizontalAlignment="Center" VerticalAlignment="Center" Width="60" Height="60" Stretch="Fill" />
          </Border>
     </DataTemplate>
 
     <!--Shape style for node-->
     <Style TargetType="Path" x:Key="nodeshapestyle">
         <Setter Property="Fill" Value="LightBlue" />
         <Setter Property="Stretch" Value="Fill" />
     </Style>
</ResourceDictionary>

public class ImageAnnotationViewModel: DiagramViewModel
{
  public ImageAnnotationViewModel()
  {
    //Initialize the nodes and connectors collection
    this.Nodes = new NodeCollection();
    this.Connectors = new ConnectorCollection();
 
    //Create the node
    NodeViewModel node = new NodeViewModel();
    node.OffsetX = 150;
    node.OffsetY = 150;
    node.UnitHeight = 150;
    node.UnitWidth = 150;
 
    //Create the annotation collection to the node
    node.Annotations = new AnnotationCollection()
    {
      new AnnotationEditorViewModel()
      {
        //adding image path as annotation content
        Content=@"pack://application:,,,/Image/image43.png",
        VerticalAlignment=VerticalAlignment.Center,
        HorizontalAlignment=HorizontalAlignment.Center,
 
        //adding ViewTemplate property 
        ViewTemplate=App.Current.Resources["viewtemplate"]as DataTemplate,
                    
        //adding EditTemplate property
        EditTemplate=App.Current.Resources["edittemplate"] as DataTemplate
      }
    };
    node.Shape = new RectangleGeometry() { Rect = new Rect(0, 0, 150, 150) };
 
    //adding shape style to the node
    node.ShapeStyle = App.Current.Resources["nodeshapestyle"] as Style;
    //Adding the created node into node's collection
    (this.Nodes as NodeCollection).Add(node);
  }
}