Thanks for the file.
I lately found the feature is supported in MS Excel so Aspose.Cells also supports this already. Please see the sample code for your reference:
Workbook workbook = new Workbook("f:\\files\\chart-with-hyperlink.xlsx");
//Get the Chart from the first worksheet.
Chart source = workbook.getWorksheets().get(0).getCharts().get(0);
ChartShape cshape = source.getChartObject();
//Add/update hyperlink for the chart shape.
//Save the Worksheet
Hope, this helps a bit.