Could you add a scheduled event to call the Feedback API to get Open items, then iterate over the results and send emails? You’d need to keep track of which items you’ve sent an email for already so you don’t keep emailing about the same items.
App team members with a role that includes the permission "Can edit ‘Stories, Documents and Feedback’." will now receive an email notification when a new feedback item is submitted. If you add the specific user to the App Team, they will be notified each time a feedback item is submitted.