Thank you for your continued interest and comments. I wanted to share an update that we have included this feature in our roadmap.
We are currently working to ship https://jira.atlassian.com/browse/JSDCLOUD-4698 and https://jira.atlassian.com/browse/JSDCLOUD-6037 to make email experience better. Once these have been rolled out, I'll provide further updates on this feature.
If you feel this feature is important to you, please feel free to directly reach out to me at email@example.com. I would love to get more insights on Customer Notification usage.
Manpreet and the Jira Service Management Team