Why was the 'Sai Leela' book, or Sai Satcharitra, written, and who was chosen to write it according to Chapter 52?

According to Chapter 52, the book "Sai Leela" was written to remember and record the experiences Sai Baba gave to His devotees from time to time. This text is described as supremely holy, containing the stories of His true character. The chapter highlights that despite having countless followers, Sai Baba specifically chose Hemadpant, who was described as being devoid of specialized knowledge and learning, to author this true life story. It is stated that Sai held Hemadpant's hand and caused the book to be written, with some of the inspiration coming from stories Baba narrated with His own mouth, and the rest coming after He departed to His own abode.