Hi sk15,
As far as I read on the documentation, this is not possible since the output or the response of the endpoint does not consist of any wise working hours.
If you need this to be added, I highly suggest providing feedback at Microsoft Graph Community Feature request.
I answered your question, please upvote it and accept it as answer. Have a great day ahead!
Reference: https://learn.microsoft.com/en-us/graph/api/calendar-getschedule?view=graph-rest-1.0&tabs=http