How to import forked echart - echarts

So far, I use the standard way to load from node_modules.
import echarts from 'echarts'
Due to the my project requirement, I have to modify some tree layout source code and build my own echart.
And I am having difficult to import.
I tried three ways, all failed.
import echart/dist folder
import echart folder
import echart.min.js
Could someone tell me the recommended way to import forked echarts?
Thank you very much.

I had the answer from echart developers.
https://github.com/apache/echarts/issues/16858#event-6405399579

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