Show count in group header

I have a list of books.

I show a table view grouped by author and then grouped by series main character.
How can I show how many books are in any group by putting a value in the group header?

Any ideas?
Thanks

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1 ACCEPTED SOLUTION

Itโ€™s OK - Iโ€™ve found -Group aggregate
Thanks

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1 REPLY 1

Itโ€™s OK - Iโ€™ve found -Group aggregate
Thanks

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