如何在QHorizontalBarSeries/QChart上绘制指定x值的垂直线？

#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QHorizontalBarSeries>
#include <QtCharts/QBarSet>
#include <QtCharts/QValueAxis>
#include <QtCharts/QLineSeries>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    // 创建水平柱状图
    QHorizontalBarSeries *series = new QHorizontalBarSeries();

    // 添加柱状图数据
    QBarSet *set = new QBarSet("Data");
    *set << 1 << 2 << 3 << 4 << 5;
    series->append(set);

    // 创建图表并设置水平坐标轴
    QChart *chart = new QChart();
    chart->addSeries(series);
    QValueAxis *axisY = new QValueAxis();
    chart->setAxisY(axisY, series);

    // 创建垂直线
    QLineSeries *lineSeries = new QLineSeries();
    lineSeries->append(3, axisY->min());
    lineSeries->append(3, axisY->max());
    chart->addSeries(lineSeries);

    // 创建图表视图并显示
    QChartView *chartView = new QChartView(chart);
    QMainWindow window;
    window.setCentralWidget(chartView);
    window.resize(400, 300);
    window.show();

    return a.exec();
}