How to Add more data fields to the NotificationForSrpCPApproval task in the BPM Worklist?

Our Requirement: We want to show the user a personalised notification displaying the comp plan name on plan distribution

What we Achieved: We are able to edit the notification from the NotificationFoSrpCPApproval Task in the BPM Worklist

Problem: From the list of available fields to be added in the expression builder for the notification, we don't have the relevant fields, specifically we need the Comp Plan Name to be added in the notification title, in the list of available fields in the task payload we have comp plan id, but not the comp plan name.

Question: Is there a way we can add the comp plan name as an extra field so that it can be added in the expression?