Custom Workflow FIORI SWFVISU Configuration

Hi Experts,

I have created custom workflow for PR requisition which is enabled in FIORI as well. I need line items and other details in FIORI which comes by triggering CDS with annotation with the help of SWFVISU configuration which now includes My-Inbox generic application option as well.

I have added standard task and copied the standard setting but i want to know where exactly we will define PurchaseReq value, as in below screen-shot, if I hard-cord value , it will pick required details, where exactly this PR values needs to be assigned so that it will pick dynamically.

Thanks

Ankesh Jindal