Hi Ana,
The current build of CKEditor 5 in this component doesn't have the Collaboration components installed. And the only method to get these available is by creating a new build via this link: https://ckeditor.com/ckeditor-5/online-builder/
This means that your can't extent an already created build and therefor there is no way add the collaboration components to the current version of this OutSystems component.
What you can do is clone my component and use it as a base. Then create a new CKEditor 5 build containing the components that you want and then replace the original ckeditor javascript file (onder Interface -> Scripts) with the new one that you have just created. You will probably also need to adjust the default toolbar and add an action here and there to get things working.
The current components installed in this CKEditor version are;

Hope this helps and let me know the outcome!
Greetings,
Vincent