如何让我的Chart.JS条形图在每个条形图上堆叠两个数据值，并在每个条形图上打印一个计算值？

// 引入Chart.JS库
import Chart from 'chart.js';

// 创建canvas元素
const canvas = document.createElement('canvas');
document.body.appendChild(canvas);

// 定义数据集
const dataset1 = {
  label: '数据集1',
  data: [10, 20, 30, 40, 50],
};

const dataset2 = {
  label: '数据集2',
  data: [5, 15, 25, 35, 45],
};

// 创建配置对象
const config = {
  type: 'bar',
  data: {
    labels: ['标签1', '标签2', '标签3', '标签4', '标签5'],
    datasets: [dataset1, dataset2],
  },
  options: {
    scales: {
      x: {
        stacked: true, // 堆叠模式
      },
      y: {
        stacked: true, // 堆叠模式
      },
    },
    plugins: {
      tooltip: {
        callbacks: {
          label: (context) => {
            const datasetIndex = context.datasetIndex;
            const dataIndex = context.dataIndex;
            const value1 = dataset1.data[dataIndex];
            const value2 = dataset2.data[dataIndex];
            const sum = value1 + value2;
            return `总计: ${sum}`;
          },
        },
      },
      datalabels: {
        anchor: 'end',
        align: 'top',
        formatter: (value, context) => {
          const datasetIndex = context.datasetIndex;
          const dataIndex = context.dataIndex;
          const value1 = dataset1.data[dataIndex];
          const value2 = dataset2.data[dataIndex];
          const sum = value1 + value2;
          return `总计: ${sum}`;
        },
      },
    },
  },
};

// 创建图表
new Chart(canvas, config);