It may be more difficult to verify the citation counts for book chapters. This happens because often there are inaccuracies and inconsistencies in the referencing data for Books (date, author and edition variations) or for Book Chapters (book v book chapter cited, plus errors and variations).
You may need to rely on additional indicators of the prestige, impact, calibre of your book and book chapters and be able to demonstrate that in words (narratives that includes other indicators of research impact).