Can we Modify the Reject Requisition Notification Email?

Summary: We are using the Expiration time limit for Requisition approval.

Once the deadline is crossed, PR rejects automatically. So we need to identify if PR is Rejected by the system due to Crossing the expiration date or Manager or User has rejected it?

I was thinking if we can modify the Rejection email notification that the user gets once PR is rejected, we could add the rejection By field or comments in that email body so that the User can identify how PR gets rejected by the system or by some user.

Content (required):We are using the Expiration time limit for Requisition approval.