No- you cannot do this in retrospect. This works as intended. You should not change the assignee of the issue for review (bad practice). Add a new user picker field called Reviewer to your issue and add the reviewer in this field.
Thanks. I assumed it, just wanted to confirm.
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You cannot query worklog information using JQL. Please see the similar question here https://community.atlassian.com/t5/Jira-questions/Time-spent-on-JIRA-issues-group-by-User/qaq-p/49425. Hope this helps you.
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