JQL doesn't appear to have a field "Code Reviewer" (but there are fields for Assignee and Reporter). Is there another way to get an overview of all the issues where a certain user is assigned as reviewer?
Welcome to community.
Assignee and Reporter system fields come by default in Jira. If you need an additional field such as "Reviewer", you need to create a custom field as a user-picker type. Please check this KB.
After creating the field, you can use in issue search console. Ex JQL: "Reviewer" = userA
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