Refinance calculator fields

Hi Team,

Your mortgage (conventional) calculator works great!

Although we need to add two different calculators to our site: Mortgage (conventional) calculator and a Refinance calculator. We will be adding them on two different pages. Is there a way to add a Refinance calculator with the following fields?:

Mortgage amount
Property value
Current interest rate
Term remaining (preferably in months, but ok in years)
Potential new interest rate

and Outcome (results) would be following:
potential savings per month by switching to another lender (ideally also the potential savings over the entire remaining term, as €30k in savings over 20 years is even more compelling than saving €125 per month).

Any help would be appreciated, please.

Thanks in advance!
Klara