How to add a reoccurring Hebrew Event to a calendar.

Currently Apple has their own calendar called Birthdays which takes the birthdays from contacts and makes it as a regular calendar event along with the birthday number, they even do this for Hebrew Birthdays. I have tried (unsuccessfully thus far) to take the same concept and create a calendar for reoccurring events on a specific date in the Hebrew Calendar. An example of this would be Yahrtzeits, which is observed on the Hebrew date each year after a person dies. I want to add it to the system calendars like how Apple does it this way it can be used with any app not just my own. Currently there isn't a way to specify the calendar (like Calendar(identifier: .hebrew) or even make a custom EKRecurrenceRule, also from some of the debugging of the Birthdays calendar, it seems that the date saved is the Gregorian date and that theres some internal calculations happening. Is there a way to add reoccurring Hebrew Events or do I need to reinvent the wheel?

How to add a reoccurring Hebrew Event to a calendar.
 
 
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