How can we define the Currency Conversion UDA in BPM Approval rule task

Summary:

We are using BPM to define purchase order approval rules. We have requirement that can be fulfilled by using Currency Conversion user defined attributes.

In FSM, we can easily define Currency Conversion user defined attribute, how can we define the same in BPM approval task?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):