That would be beyond what can be done with ACF. You’d need to build a new field type using the ACF WYSIWYG editor for a base https://www.advancedcustomfields.com/resources/creating-a-new-field-type/ and then create custom JavaScript for that field type that would do what you want done https://www.advancedcustomfields.com/resources/adding-custom-javascript-fields/. Can it be done, probably, but not easily.
If you don’t want people to edit the field I would actually use a message field where the content of that message field is built using JavaScript that reads the values of the other fields as well as being updated when a change is made to one of the other fields. Still complicated but I think more likely to happen. If you’re interested in this I can point you to some JS that adds custom actions to different types of fields to get you started.
