I never use X-Ray as it is never in the books I read. But you have to remember that X-Ray must be added by the book's author/designer/publisher. The person that adds the X-Ray files is also the one who decides what information is included. There might be some firmware X-Ray features, but I doubt it. So X-Ray from book to book varies as far as the info it contains. The Kindle app cannot just magically create this material, it has to rely on the author/designer/publisher added material.