How to configure the Fields plugin to filter the domain

Question

I have an Author who has a Book.

class Author {
   String name
   Book book
}

The <f:all bean="Author"/> tag in the edit.gsp will create a html textbox with the Author.name and a html dropdown box with all the books in the html element.

How to setup the Fields plugin to only show just a sub-set of the books (not all the books)?

Answer 1

(from the question...)

How to setup the Fields plugin to only show just a sub-set of the books (not all the books)?

(from a comment...)

So, I want the Fields plugin to fill out the book dropdown with all the books that are published by Penguin only.

The fields plugin does not provide a mechanism to do that filtering.