To enable users to create and configure CC or participant field in JIRA.
- Create a Custom Field called CC with custom field type as User Picker (multiple user).
- Add the newly created Custom Field CC to the relevant Screens that you require it for.
- Go to the relevant project’s Notification Scheme and add notification for the relevant Event. or you can select this field in the Permission Scheme Browse permission.
For example: Notify CC users when the particular Issue is updated, or make your tickets privates except for the CC users ( remember that the watchers field don’t works for this purpose ).