如何在Chart.js图形中显示数据标签？

options: {
  plugins: {
    datalabels: {
      display: true
    }
  }
}

datasets: [{
  label: '数据集1',
  data: [10, 20, 30, 40],
  datalabels: {
    color: 'black',
    anchor: 'end',
    align: 'top'
  }
}]

new Chart(canvas, {
  type: 'bar',
  data: {
    labels: ['标签1', '标签2', '标签3', '标签4'],
    datasets: [{
      label: '数据集1',
      data: [10, 20, 30, 40],
      datalabels: {
        color: 'black',
        anchor: 'end',
        align: 'top'
      }
    }]
  },
  options: {
    plugins: {
      datalabels: {
        display: true
      }
    }
  }
});