• Add a new class that implements the Annotator (alias PropertyAnnotator) interface via the PropertyAnnotatorDecorator base class
• Register the implementation with the AnnotatorFactory
• Use either the NewRevisionFromEditComplete or ParserAfterTidy hook to invoke the AnnotatorFactory method created and annotate values as demonstrated by existing PropertyAnnotator

See also

• AttachmentLinkPropertyAnnotator.php
• TranslationPropertyAnnotator.php