Is there any way we can add the supplier name in the Requisition Approval notification

We have a requirement to include the Supplier Name in the Requisition Approval Notification.I attempted to retrieve it through the BPM workflow, and although the Supplier Name attribute is available, it consistently returns a null value. In fact, all fields within the result set appear blank.

Could you please advise if there is an alternative approach or if any additional configuration is required to fetch this information?