如何在条形图顶部显示标志？

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)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(75, 192, 192, 0.2)'
            ],
            borderColor: [
                'rgba(255, 99, 132, 1)',
                'rgba(54, 162, 235, 1)',
                'rgba(75, 192, 192, 1)'
            ],
            borderWidth: 1
        }]
    },
    options: {
        plugins: {
            labels: {
                render: 'value',
                position: 'top',
                fontColor: '#000',
                fontSize: 12,
                fontStyle: 'bold'
            }
        },
        scales: {
            y: {
                beginAtZero: true
            }
        }
    }
});