如何在chart_flutter时间序列中实现数据？

import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;

class TimeSeriesChartExample extends StatelessWidget {
  final List<charts.Series> seriesList;
  final bool animate;

  TimeSeriesChartExample(this.seriesList, {this.animate});

  factory TimeSeriesChartExample.withSampleData() {
    return new TimeSeriesChartExample(
      _createSampleData(),
      animate: false,
    );
  }

  @override
  Widget build(BuildContext context) {
    return new charts.TimeSeriesChart(
      seriesList,
      animate: animate,
      // 配置图表属性
      domainAxis: new charts.DateTimeAxisSpec(
        tickFormatterSpec: new charts.AutoDateTimeTickFormatterSpec(
          day: new charts.TimeFormatterSpec(
            format: 'dd',
            transitionFormat: 'dd MMM',
          ),
        ),
      ),
      primaryMeasureAxis: new charts.NumericAxisSpec(
        tickProviderSpec: new charts.BasicNumericTickProviderSpec(
          zeroBound: false,
        ),
      ),
    );
  }

  static List<charts.Series<TimeSeriesData, DateTime>> _createSampleData() {
    final data = [
      new TimeSeriesData(new DateTime(2022, 1, 1), 5),
      new TimeSeriesData(new DateTime(2022, 1, 2), 10),
      new TimeSeriesData(new DateTime(2022, 1, 3), 15),
      new TimeSeriesData(new DateTime(2022, 1, 4), 20),
      new TimeSeriesData(new DateTime(2022, 1, 5), 25),
    ];

    return [
      new charts.Series<TimeSeriesData, DateTime>(
        id: 'Sample Data',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (TimeSeriesData data, _) => data.time,
        measureFn: (TimeSeriesData data, _) => data.value,
        data: data,
      ),
    ];
  }
}

class TimeSeriesData {
  final DateTime time;
  final int value;

  TimeSeriesData(this.time, this.value);
}