Respond to Questionnaire Subject line customization for both email and in app notification

We have a requirement to customize subject line of various notifications sent to the Grantees and internal responders at various stages off the process. We checked BPM Worklist-Task Configuration for RespondtoQstnrfyi - The Title field has value "/task:task/task:payload/task:TitleResourceKey", so its using resource key bundle for different notification subjects. We could not find a way to edit this and change subject for different notifications. We need oracle's guidance on how to achieve one of the following: 1. A way to update the subject lines for Pending, Overdue and invited and other notifications 2. Or