seriesRenderer property
Used to access the series properties.
Defaults to null.
Widget build(BuildContext context) {
   ChartSeriesController _chartSeriesController;
   return Container(
       child: SfCircularChart(
           series: PieSeries<SalesData, num>(
                   onRendererCreated:
                     (CircularSeriesController controller) {
                      _chartSeriesController = controller;
                      // prints series yAxisName
                     print(_chartSeriesController.seriesRenderer
                        .seriesRendererDetails.series.yAxisName);
                   },
               ),
       )
    );
}
Implementation
late final CircularSeriesRenderer<T, D> seriesRenderer;