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You can't do what you want without writing a plugin or some calibre python scripts. The problem: the search interface and the template system can "see" metadata for the book. It cannot ask questions that require knowledge from multiple books. In your case it needs to know that a book has the same author as some other book that you marked as read.
A script or plugin would do two things:
1) Pass over the library generating a list of all authors of read books.
2) Pass over the library again setting a custom column for a book if it has an author in the list.
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