Use: https://www.npmjs.com/package/ngx-quill
https://github.com/KillerCodeMonkey/ngx-quill
See: https://quilljs.com/
Spell checking with Quill: https://medium.com/beyond-webspellchecker/befriending-wysiwyg-editors-text-highlighting-with-virtual-underlines-48c80a680b2f