Flutter show y axis values as string

I have a simple graph in which I have x-axis as string and y-axis as int but my values are too long 10000 I need to show it as 10k

My code

     Container(
          height: MediaQuery.of(context).size.height * 0.25,
          child: SfCartesianChart(
              enableAxisAnimation: true,
              primaryXAxis: CategoryAxis(
                  majorGridLines: MajorGridLines(width: 0),
                  //Hide the axis line of x-axis
                  axisLine: AxisLine(width: 0),
                  interval: 1),
              primaryYAxis: NumericAxis(
                minimum: 0, maximum: highSale,
                interval: highSale < 200 ? 100 : 2000,
                majorGridLines: MajorGridLines(width: 0),
                //Hide the axis line of x-axis
                axisLine: AxisLine(width: 0),
              ),
              tooltipBehavior: _tooltip,
              plotAreaBorderWidth: 0,
              legend: Legend(isVisible: false),
              series: <ChartSeries<_ChartData, String>>[
                ColumnSeries<_ChartData, String>(
                    dataSource: weekly
                        ? data
                        : yearly
                            ? dataMonth
                            : monthly
                                ? dataDaily
                                : daily
                                    ? dataDaily
                                    : [],
                    xValueMapper: (_ChartData data, _) => data.x,
                    yValueMapper: (_ChartData data, _) => data.y,
                    
                    pointColorMapper: (_ChartData data, _) => data.color,
                    name: 'Week',
                    color: weekly ? kPrimaryColor : Colors.red)
              ]),
        ),
        

In the image you can see it's showing 36000 I need to show it as 36k I try to convert it to k value but the issue is on yValueMapper it's showing string isn't allowed. So what I was thinking is maybe there is some value to show mapper? like graph will work on value mapper and text will be different.

The above answer is correct but you need to format the primary axis

Like this

  primaryYAxis: NumericAxis(
    numberFormat: NumberFormat.compact(),
  )