如何在填充了多个DataSets的AreaChart中添加单个标记？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class AreaChartWithMarker extends Application {

    @Override
    public void start(Stage primaryStage) {
        // 创建坐标轴
        NumberAxis xAxis = new NumberAxis();
        NumberAxis yAxis = new NumberAxis();

        // 创建AreaChart对象
        AreaChart<Number, Number> areaChart = new AreaChart<>(xAxis, yAxis);
        areaChart.setTitle("Area Chart with Marker");

        // 创建DataSet对象
        XYChart.Series<Number, Number> dataSet1 = new XYChart.Series<>();
        dataSet1.setName("Data Set 1");
        dataSet1.getData().add(new XYChart.Data<>(1, 10));
        dataSet1.getData().add(new XYChart.Data<>(2, 20));
        dataSet1.getData().add(new XYChart.Data<>(3, 30));

        XYChart.Series<Number, Number> dataSet2 = new XYChart.Series<>();
        dataSet2.setName("Data Set 2");
        dataSet2.getData().add(new XYChart.Data<>(1, 5));
        dataSet2.getData().add(new XYChart.Data<>(2, 15));
        dataSet2.getData().add(new XYChart.Data<>(3, 25));

        // 将DataSet对象添加到AreaChart中
        areaChart.getData().addAll(dataSet1, dataSet2);

        // 创建Marker对象
        Label marker = new Label("Marker");
        marker.setStyle("-fx-background-color: red; -fx-text-fill: white; -fx-padding: 5px;");

        // 设置Marker的位置
        marker.layoutXProperty().bind(areaChart.getXAxis().widthProperty().divide(2));
        marker.layoutYProperty().bind(areaChart.getYAxis().heightProperty().divide(2));

        // 创建界面布局
        StackPane root = new StackPane();
        root.getChildren().addAll(areaChart, marker);

        // 创建场景并显示
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}