how to add external js in HTMLField of djangocms_text_ckeditor

Question

I am using the djangocms in my project and I wanted to have some custom changes for that I need to add some js and css files in HTMLField of the djangocms_text_ckeditor. I found the documentation for adding the css links in the setting.py, which is as follows:

CKEDITOR_SETTINGS = {
    'contentsCss': ['/static/css/base.css'],
}

But not know to add the js file in HTMLField of the djangocms_text_ckeditor. Any help will be appreciated. Thank you.