labelLayout not works in production env (echarts v5.2)

Version

5.2.0

Steps to reproduce

{
  type: 'pie',
  radius: ['20%', '60%'],
  avoidLabelOverlap: false,
  labelLayout() {
    return {
      x: 200,
      y: 50,
      align: 'left',
    };
  },
  ...
}

When use ECharts v5.2, labelLayout works in local Env, but not works in production.

Then i change the version to v5.1.1, labelLayout works in local and production Env both.

What is expected?

On Echarts v5.2, labelLayout works in production.

What is actually happening?

not works

[pissang]

import { LabelLayout } from 'echarts/features';
echarts.use([LabelLayout]);

@percy507 This solution should work.

[pissang]

@percy507 Thanks for the suggestion. Will improve document and examples.