plugin-babel-import-chunkname.js

function addComments(arg, name) {
  // 当参数前的注释不存在的情况, 加入 webpackChunkName 注释
  if (!arg.leadingComments) {
    arg.leadingComments = [
      {
        type: 'CommentBlock',
        value: ` webpackChunkName: '${name}' `,
      },
    ]
  }
}

module.exports = function(babel) {
  const { types: t } = babel

  return {
    name: 'ast-transform', // not required
    visitor: {
      CallExpression: function(path) {
        const { node } = path
        if (t.isImport(node.callee)) {
          const arg0 = node.arguments[0]
          const name = arg0.value
          addComments(arg0, name.replace(/.*\/(.*)$/, '$1'))
        }
      },
    },
  }
}

Doesn't seem to work with await import(). Do you have any clue why?