CKEditor 5 is officially integrated with a multilingual text checker, WProofreader, and you can customize the tool to add relevant proper nouns - from your company or product name to clients’ surnames and corpo-slang expressions - to your custom, corporate dictionary.
This is a premium feature that is additionally paid on top of CKEditor 5 commercial license fee and delivered by our partner, WebSpellChecker. Please contact us if you have any feedback or questions.