The simple search function is part of the core of JIRA and doesn't have any hooks for adding things to it. You'd need to amend the code of JIRA to change it, not just plug something in.
Atlassian provide the most commonly used fields and then provide all the other searchable fields under the "more" button, so I'm not sure what you'd want to add in there.
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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