JQL have a feature for "Updated" but that works with "Date" not with "Users".
If you don't have a custom field that stores who last updated the ticket, you won't have any way to do what you want unless you use plugins or DB queries (like what have been initially suggested).
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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