ChartJs如何通过数据集的值在轴上显示水平线和垂直线？

// 引入chartjs-plugin-annotation插件
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-annotation@1.0.0/dist/chartjs-plugin-annotation.min.js"></script>

// 创建图表
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
        datasets: [{
            label: 'My Dataset',
            data: [65, 59, 80, 81, 56, 55, 40],
            fill: false,
            borderColor: 'rgb(75, 192, 192)',
            tension: 0.1
        }]
    },
    options: {
        plugins: {
            annotation: {
                annotations: [{
                    type: 'line',
                    mode: 'horizontal',
                    scaleID: 'y',
                    value: 70,
                    borderColor: 'red',
                    borderWidth: 2,
                    label: {
                        enabled: true,
                        content: 'Threshold'
                    }
                }]
            }
        }
    }
});

// 引入chartjs-plugin-datalabels插件
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.0.0/dist/chartjs-plugin-datalabels.min.js"></script>

// 创建图表
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
        datasets: [{
            label: 'My Dataset',
            data: [65, 59, 80, 81, 56, 55, 40],
            fill: false,
            borderColor: 'rgb(75, 192, 192)',
            tension: 0.1
        }]
    },
    options: {
        plugins: {
            datalabels: {
                display: false
            },
            annotation: {
                annotations: [{
                    type: 'line',
                    mode: 'vertical',
                    scaleID: 'x',
                    value: 'March',
                    borderColor: 'blue',
                    borderWidth: 2,
                    label: {
                        enabled: true,
                        content: 'Event'
                    }
                }]
            }
        }
    }
});