What is the primary purpose and origin of the Sai Satcharitra as explained in Chapter 52?

Chapter 52 of the Sai Satcharitra provides a retrospective review, stating that the book, also called "Sai Leela," was written to remember the experiences Sai Baba gave to His devotees while He was in His physical body. It is described as a supremely holy text that contains a sacrificial session of the stories of His true character. The chapter reveals that Hemadpant was chosen by Sai to write this biography, despite his own feeling of lacking specialized knowledge. Furthermore, it is mentioned that the inspiration for the book came after Sai's departure, stemming from the profound stories He Himself had narrated to His disciples.