MS Booking API - getStaffAvailability - Does it incorporate buffer time and lead time?

I am testing MS Booking API for PoC Booking project in my company.
So far, I am familiar with the API.

I want to know if getStaffAvailability (which get availability of specified staff id and time period) does incorporate buffer time and lead time.
https://learn.microsoft.com/en-us/graph/api/bookingbusiness-getstaffavailability?view=graph-rest-1.0&tabs=http

It seems it does not. It just provide block of available, outOfOffice and busy.

I assume I need to fetch buffer time, lead time from the service using MS Booking API then calculate proper block of available time manually?