It is fairly easy to add people as watchers during issue creation using Automation for JIRA!
If you want add a known set of watchers you can simple add them using the add watchers action:
Though if you want to be able to specify the user on the create screen, you will need to add a user customfield and then copy that user to the watchers.
You could also delete the user from the customfield so it wont show up. It is fairly similar to the approach used to add request participants in Service Desk - https://blog.codebarrel.io/automation-of-the-week-add-request-participants-on-ticket-creation-in-jira-service-desk-675af383f7e6#.wudq4ual0
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