You can configure standard user-picker fields to follow similar rules as the assignee field does. Create one and have a look at the configuration after its been created - you should find a way to set up some rules.
when I go to the following
Find the custom field you want to configure and click > Configure > Edit Options > Edit User Filtering.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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