My Italian is too rudementary to even consider buying this book and I do not know how detailed it is, but I just found out that this book was published this month:

Jan Dismas Zelenka. La vita e l'opera di un musicista boemo tra Praga, Dresda e Vienna (Claudio Bolzan)

https://www.mondadoristore.it/Jan-Di...217/#tabMenu-4

Looking forward to traveling to Prague next Thursday for my first Zelenka festival.