DE with value of a base commit + change commits

I'm looking for a way to view the current value of a contract in a BP form; I understand there might be ways to do this via a custom print but I need to show this in the contract upper form.

We're using Unifier v20.1 and have separate business processes, one for creating a contract and another for creating variations to a contract.

The total value of variations can be viewed via a summary element on the contract upper form alongside the original contract value but how can I see the UPDATED contract value? i.e. contract value + variations??

Having the ability to do this would unlock much potential in Unifier for us.