Can I change the initial label text style in syncfusion chart?

In the Syncfusion chart, text style of axis label can be initially changed depending on the pointIndex of any of the label?

The code I use has a separate widget on the data label. But I can't change the names in XValueMapper.

To make it clearer, below is an example of a piece of code I use:

SfCartesianChart(
        title: ChartTitle(
          text: title,
          backgroundColor: titleBackColor,
          textStyle: titleStyle,
        ),
        selectionGesture: ActivationMode.singleTap,
        selectionType: SelectionType.point,
        series: <ChartSeries>[
          StackedBar100Series<RankingChartData, String>(
              dataLabelSettings: DataLabelSettings(
                builder: (
                  data,
                  point,
                  series,
                  pointIndex,
                  seriesIndex,
                ) {
                  if (chartData[pointIndex].name.contains(name!)) {
                    return Padding(
                      padding: EdgeInsets.only(right: 150.0.w),
                      child: Icon(
                        Icons.check_box,
                        color: primary.base,
                      ),
                    );
                  } else {
                    return const SizedBox();
                  }
                },
                isVisible: true,
              ),
              dataSource: chartData,
              selectionBehavior: _selectionBehavior,
              xValueMapper: (RankingChartData exp, _) => exp.name,
              yValueMapper: (RankingChartData exp, _) => exp.positive,
              color: positiveColor ?? Colors.green,
              sortingOrder: sort ? SortingOrder.ascending : null,
              sortFieldValueMapper:
                  sort ? (RankingChartData exp, _) => exp.positive : null,
              onPointTap: (d) {
                showDialog(
                    context: (context),
                    builder: (context) {
                      return AlertDialog(
                        title: Text(chartData[d.pointIndex!].name),
                        content: Text.rich(TextSpan(children: [
                          const TextSpan(text: "Positive\n"),
                          TextSpan(
                            text: chartData[d.pointIndex!].positive.toString(),
                            style: TextStyle(
                              color: positiveColor ?? Colors.green,
                              fontSize: 20.sp,
                            ),
                          ),
                        ])),
                      );
                    });
              }),
        ],
        primaryXAxis: CategoryAxis(),
      ),