series property
Customizes the chart series.
Widget build(BuildContext context) {
  return Container(
    child: SfFunnelChart(
      series: FunnelSeries<_FunnelData, String>(
        dataSource: data,
        xValueMapper: (_FunnelData data, _) => data.xData,
        yValueMapper: (_FunnelData data, _) => data.yData,
      ),
    ),
  );
}
Implementation
final FunnelSeries series;