Rotation information

GoJS
1

I would like to show the rotation information as shown in the image below. How do I do that?

Untitled
Untitled.png646×533 16.6 KB

2 
    myDiagram.nodeTemplate =
      $(go.Node, "Auto",
        {
          resizable: true,
          rotatable: true,
          locationSpot: go.Spot.Center,
          selectionAdornmentTemplate:
            $(go.Adornment, "Vertical",
              $(go.Panel, "Auto",
                { margin: 10 },
                $(go.Shape, { fill: null, stroke: "dodgerblue", strokeWidth: 2 }),
                $(go.Placeholder, { padding: 1 })
              ),
              $(go.TextBlock,
                { background: "lightyellow "},
                new go.Binding("angle", "angle", function(a) { return -a; }).ofObject(),
                new go.Binding("text", "angle", function(a) { return a.toFixed(0); }).ofObject())
            )
        },
        $(go.Shape,
          { fill: "white" },
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 8, editable: true },
          new go.Binding("text").makeTwoWay())
      );