如何在chart.js堆叠条形图的每个条形中添加数据标签？

<canvas id="myChart"></canvas>

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['标签1', '标签2', '标签3'],
        datasets: [{
            label: '数据集1',
            data: [10, 20, 30],
            backgroundColor: 'rgba(255, 99, 132, 0.2)',
            borderColor: 'rgba(255, 99, 132, 1)',
            borderWidth: 1
        }, {
            label: '数据集2',
            data: [15, 25, 35],
            backgroundColor: 'rgba(54, 162, 235, 0.2)',
            borderColor: 'rgba(54, 162, 235, 1)',
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            x: {
                stacked: true
            },
            y: {
                stacked: true
            }
        },
        plugins: {
            legend: {
                display: true
            },
            datalabels: {
                anchor: 'end',
                align: 'end',
                color: '#000',
                font: {
                    weight: 'bold'
                },
                formatter: function(value, context) {
                    return value;
                }
            }
        }
    }
});