如何创建java poi条形图结合两个条形值，如给定的图像？

Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Bar Chart");

Row row1 = sheet.createRow(0);
row1.createCell(0).setCellValue("Value 1");
row1.createCell(1).setCellValue(10);

Row row2 = sheet.createRow(1);
row2.createCell(0).setCellValue("Value 2");
row2.createCell(1).setCellValue(20);

Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 10, 15);

Chart chart = drawing.createChart(anchor);
ChartLegend legend = chart.getOrCreateLegend();
legend.setPosition(LegendPosition.BOTTOM);

BarChartData data = chart.getChartDataFactory().createBarChartData();

ValueAxis bottomAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.BOTTOM);
ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);
leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

ChartDataSource<Number> xs = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 1, 0, 0));
ChartDataSource<Number> ys1 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 0, 1, 1));
ChartDataSource<Number> ys2 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 1, 1, 1));

data.addSeries(xs, ys1);
data.addSeries(xs, ys2);

chart.plot(data, bottomAxis, leftAxis);

FileOutputStream fileOut = new FileOutputStream("bar_chart.xlsx");
workbook.write(fileOut);
fileOut.close();
workbook.close();