At the moment it's not possible to achieve this level of restrictions within JIRA built-in tools solely.
However, you can try this plugin as it might be exactly what you are looking for:
Also, please check https://jira.atlassian.com/browse/JRA-1330 for discussions, reasons why you can't do it, and LOADS of workarounds.
I hope it helps!
Hey everyone! My name is Sarah Schuster, and I'm a Customer Success Manager in Atlassian specializing in Jira Software Cloud. Over the next few weeks I will be posting discussion topics (8 total) to ...
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