If I understand your requirements and if you are trying to do this for JSD then you could use Automation.
When: Issue Created
If: Issue Matches, Reporter <list or group>
Then: Edit Issue, Priority
I would create a group (VIP) and add users to the group as it would be easier to report (dashboard/filter) on the VIP group.
If you wanted you could even create a unique priority intended for VIP only depending on your needs.
The user accounts don't support that.
You could put a user property on the accounts, but it wouldn't be visible generally. You might be better off putting them into a group though.
However you do it, you'll need to write code to pick up the indicator and set the higher priority.
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