How did the book "Sai Satcharitra" come into being, and what was Hemadpant's role according to Chapter 52?

According to the retrospective review in Chapter 52, the book "Sai Satcharitra" was written to remember the experiences Sai Baba gave to His devotees. The chapter explains that Sai Baba Himself chose Hemadpant to be the author, despite Hemadpant considering himself to be devoid of specialized knowledge and learning. It is stated that Sai held his hand and caused this true life story to be written. Furthermore, some of the content came directly from Sai, who narrated His own fame for His disciples to hear, and the inspiration for the book came after He departed to His own abode.