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