Basically this: https://memo.cash/post/7350b56478b19dea408ee7b35fbfb400c8d6934da20b3c26795231ae35019a4d
You have to change the main.754c78b796d530545a9e.bundle.js file with your own.
Easy way is to get Requestly Chrome extension, and make a setting like this:
Then start your own local http server and host the modified main.bundle.js