Passing Period from Pipeline STARTPERIOD variable to Business Rule

Summary:

How to pass period from pipeline variable $startperiod to business rule

Content (please ensure you mask any confidential information):

I have a pipeline that I want to create which has an integration that runs, and then a rule that runs afterwards (or in parallel) that copies some data from a prompted scenario / version into the target scenario, for the periods loaded in the integration.

I can use the $STARTPERIOD and $ENDPERIOD variables in pipeline to select the periods to run the integration on, for example P1-FY23 to P3-FY23. However, I then want to pass P1 and P3 to the prompts in the rule, without the user needing to enter them twice when running the integration.