npm install --save-dev raw-tree-replace-loader

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.json$/,
        use: [
          {
            loader: require.resolve('raw-tree-replace-loader'),
            options: {
              include: /rdoc\.tree\.data\.json$/, // 检查包含的文件名字
              extensions: /\.md/,
              directoryTrees: { // 指定目录生成目录树，json
                dir: ['/path/to/dir'],
                mdconf: true,
                extensions: /\.md/,
                relativePath: true, // 获取相对目录, dir 参数替换，路径的前部分
              }
            }
          }
        ]
      }
    ]
  }
}