If a person or an organization helped in any way, it must be made known. That is, it must be acknowledged. The help may be direct or indirect. Your statement can include a dedication.
For many books, you can type (write about) acknowledgements in text boxes. Each text box has a Bloom callout box that describes its purpose and usually the language that the text box is set to use.
Here is a general overview:
On the Title Page, below the text boxes for the book titles, there are two text boxes that use language 2.
You can acknowledge the contributions of writers, illustrators, editors and any other people, and any funding agencies that helped pay for the book.
On the Credits Page, below the copyright and license information, there are two text boxes that use language 2.
You can type the name of the translator of the book and any additional acknowledgements.