You can add annotations to your Charts and Graph drawing in Visio.
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On the Shapes pane, from Charting Shapes, drag any of these shapes on to the drawing page — 1-D word balloon, 2-D word balloon, Horizontal callout, or Annotation.
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With the shape selected, type the text you want.
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Drag the control handle or endpoint at the end of the pointer to change the pointer’s length or direction.
Tip: You can glue the endpoint of the annotation to a connection point on the chart or graph so that the annotation stays connected if you move the shape. To do this, select the entire shape — not a subshape — and then add a connection point. Drag the endpoint of your annotation shape to the connection point. If you resize the chart or graph, you may need to move the connection point.