I'd strongly recommend not doing that. Jira's database is a data store, not a reporting model, and you certainly can't write to it.Could you explain what you are actually trying to achieve for the end user and why the custom fields can't already do it?
You would need an add-on for it. For example, Power Custom Fields Pro
You can create a combobox which would produce values from a database or JIRA API. I would strongly recommend not to query Jira database for information. Use Jira API instead.
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