Additional options for duplicate alerts.

Hi Team,
Just wanted to know is there a way we can have an extra field for duplicate alerts except which are already available we can have extra field. Let me explain what i am thinking about.
In my country there was a major change in tax system and we implemented a centralized tax system with unique IDs for each business. I want to set that unique ID number for duplicate alerts. If we do that then how can we edit the addon or may be you can do that in your addon, because some times we have noticed here in my country people use same phone numbers for multiple businesses and sometimes digital marketers(someone working on owner behalf) use their own emails for listings.