How did the book 'Sai Leela' or 'Sai Satcharitra' come to be written, and what is its stated purpose?

According to Chapter 52, the book 'Sai Leela' was written to remember the experiences Sai Baba gave to His devotees while He was in His body. The text highlights that Sai Himself chose Hemadpant to author this true life story, holding his hand through the process despite Hemadpant feeling he lacked specialized knowledge. The inspiration for the book came after Sai's passing, based on the profound stories He Himself had narrated. The purpose of reading this life story is to gain enlightenment for this world and the next, and it is described as supremely holy.