Set public holidays days (non-working days) in office hours#810

I would like to have an option to set specific days as non-working days on a global level (e.g. where you set the office hours) for which we will not accept any appointments regardless of the employee availability.
We can do this ideally by connecting to a shared calendar (e.g. a google calendar) that will include the public holidays/non-working days, or py setting them manually