public override string ToJson( 
   JsonSerializationSettings settings
)

{
  //Note: on the QueuedTask
  //Place symbol on the layout
  MapPoint location = MapPointBuilderEx.CreateMapPoint(new Coordinate2D(9, 1));

  //specify a symbol
  var pt_symbol = SymbolFactory.Instance.ConstructPointSymbol(
                        ColorFactory.Instance.GreenRGB);

  //create a CIMGraphic 
  var graphic = new CIMPointGraphic()
  {
    Symbol = pt_symbol.MakeSymbolReference(),
    Location = location //center of map
  };
  //Or use GraphicFactory
  var graphicFactory = GraphicFactory.Instance.CreateSimpleGraphic(location, pt_symbol);

  ElementFactory.Instance.CreateGraphicElement(layout, graphic);
  ElementFactory.Instance.CreateGraphicElement(layout, graphicFactory);
}

{
  //Note: Must be on QueuedTask.Run
  //Place symbol on the layout
  MapPoint location = MapPointBuilderEx.CreateMapPoint(new Coordinate2D(9, 1));

  //specify a symbol
  var pt_symbol = SymbolFactory.Instance.ConstructPointSymbol(
                        ColorFactory.Instance.GreenRGB);

  ElementFactory.Instance.CreateGraphicElement(layout, location, pt_symbol);
}

{
  //Note: Must be on QueuedTask.Run

  //List of Point graphics
  var listGraphics = new List<CIMPointGraphic>();
  var listGraphicsFactory = new List<CIMPointGraphic>();
  //Symbol
  var pointSymbol = SymbolFactory.Instance.ConstructPointSymbol(
                                      ColorFactory.Instance.BlackRGB);
  //Define size of the array
  int dx = 5;
  int dy = 5;
  MapPoint point = null;
  //Create the List of graphics for the array
  for (int row = 0; row <= dx; ++row)
  {
    for (int col = 0; col <= dy; ++col)
    {
      point = MapPointBuilderEx.CreateMapPoint(col, row);
      //create a CIMGraphic 
      var graphic = new CIMPointGraphic()
      {
        Symbol = pointSymbol.MakeSymbolReference(),
        Location = point
      };
      listGraphics.Add(graphic);
      //Or use GraphicFactory
      var graphicFactory = GraphicFactory.Instance.CreateSimpleGraphic(
                                    point, pointSymbol) as CIMPointGraphic;
      listGraphicsFactory.Add(graphicFactory);
    }
  }
  //Draw the array of graphics

  var bulkgraphics = ElementFactory.Instance.CreateGraphicElements(
                                                     layout, listGraphics);
  var bulkgraphicsFactory = ElementFactory.Instance.CreateGraphicElements(
                                                     layout, listGraphicsFactory);
}

{
  //Note: Must be on QueuedTask.Run

  //Place symbol on the layout
  MapPoint point = MapPointBuilderEx.CreateMapPoint(new Coordinate2D(9, 1));

  //specify a symbol
  var pt_symbol = SymbolFactory.Instance.ConstructPointSymbol(
                        ColorFactory.Instance.GreenRGB);

  //create a CIMGraphic 
  var graphic = new CIMGraphicElement()
  {
    Graphic = new CIMPointGraphic()
    {
      Symbol = pt_symbol.MakeSymbolReference(),
      Location = point //A point in the layout
    }
  };
  ElementFactory.Instance.CreateElement(layout, graphic);
}

{
  //Note: Must be on QueuedTask.Run(() => { ...

  //Build geometry
  Coordinate2D ll = new Coordinate2D(0.5, 1);
  Coordinate2D ur = new Coordinate2D(2.5, 2);
  Envelope env = EnvelopeBuilderEx.CreateEnvelope(ll, ur);

  //Create and add element to layout
  string picPath = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures),
    "SamplePicture.jpg");
  var pic_gr = ElementFactory.Instance.CreatePictureGraphicElement(
    layout, env.Center, picPath, "New Picture", true, new ElementInfo() { Anchor = Anchor.CenterPoint });
}

{
  // Note: must be called on the QueuedTask
  {
    //Place symbol in the center of the map
    var extent = MapView.Active.Extent;
    var location = extent.Center;

    //specify a symbol
    var pt_symbol = SymbolFactory.Instance.ConstructPointSymbol(
                          ColorFactory.Instance.GreenRGB);

    //create a CIMGraphic 
    var graphic = new CIMPointGraphic()
    {
      Symbol = pt_symbol.MakeSymbolReference(),
      Location = location //center of map
    };
    graphicsLayer.AddElement(graphic);
  }
}

{
  //Point Feature layer to convert into graphics
  var lyr = MapView.Active?.Map?.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault(s => s.ShapeType == esriGeometryType.esriGeometryPoint);
  if (lyr == null) return;
  // Note: must be called on the QueuedTask
  {
    //Point symbol for graphics
    var pointSymbol = SymbolFactory.Instance.ConstructPointSymbol(CIMColor.CreateRGBColor(100, 255, 40), 10, SimpleMarkerStyle.Circle);
    //Collection to hold the point graphics
    var listGraphicElements = new List<CIMGraphic>();
    //Iterate through each point feature in the feature layer
    using (RowCursor rows = lyr.Search()) //execute
    {
      int i = 0;
      while (rows.MoveNext())
      {
        using var feature = rows.Current as Feature;
        //Create a point graphic for the feature
        var crimePt = feature.GetShape() as MapPoint;
        if (crimePt != null)
        {
          var cimGraphicElement = new CIMPointGraphic
          {
            Location = crimePt, //MapPoint
            Symbol = pointSymbol.MakeSymbolReference()
          };
          //Add the point feature to the collection
          listGraphicElements.Add(cimGraphicElement);
          i++;
        }
      }
    }
    //Magic happens...Add all the features to the Graphics layer 
    graphicsLayer.AddElements(listGraphicElements);
  }
}