useSeriesColor property
Uses the point color for filling the track.
Defaults to false.
Widget build(BuildContext context) {
   return Container(
       child: SfCircularChart(
           series: <RadialBarSeries<ChartData, String>>[
               RadialBarSeries<ChartData, String>(
                 useSeriesColor:true
               ),
           ],
       )
  );
}
Implementation
final bool useSeriesColor;