如何通过Apache POI设置Excel Sunburst图表中各个数据标签的文本属性？

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");

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();
ChartData data = chart.getChartDataFactory().createSunburstChartData();
data.addSerie(data.getChartDataFactory().createCategorySeries(sheet.getRow(0), 1, 2, 3));
chart.plot(data, new ChartAxis[]{}, legend);

ChartPlotArea plotArea = chart.getOrCreatePlotArea();
ChartAxis[] axes = plotArea.getAxes();
for (ChartAxis axis : axes) {
    if (axis instanceof CategoryAxis) {
        CategoryAxis categoryAxis = (CategoryAxis) axis;
        for (ChartDataSource<?> category : categoryAxis.getCategories()) {
            for (ChartDataSource<?> dataPoint : categoryAxis.getDataPointsForCategory(category)) {
                ChartTextSource<?> textSource = dataPoint.getDataLabel();
                if (textSource instanceof RichTextString) {
                    RichTextString richTextString = (RichTextString) textSource;
                    Font font = workbook.createFont();
                    font.setFontName("Arial");
                    font.setFontHeightInPoints((short) 12);
                    font.setBold(true);
                    richTextString.applyFont(font);
                }
            }
        }
    }
}

try (FileOutputStream fileOut = new FileOutputStream("workbook.xlsx")) {
    workbook.write(fileOut);
}