asynchronously load ckeditor.config scripts

Hi, I've met some problems using self-host ckeditor.js file with ckeditor.load().

Usually, FE engineers usually uses "defer" for js script loading. I've tried to load ckeditor.js with and ckeditor.load("..."), there will be error in the console. I guess there's inline scripts run before the loading of ckeditor.js. So is there any solution to load ckeditor.config() scripts asynchronously after ckeditor.js has already been loaded?