Wix Paid Plans with specific expiry date (financial year memberships)

Hi, hoping its possible to use wix Paid Plans api to somehow have all paid memberships expire on the same day. I can only see it so a year plan lasts a year from the date purchased, but a few of my clients have memberships that all expire at the same time, regardless of if members get a full year or not.

Any way to set the expiration date as a plan is purchased? Or a way to loop through and cancel all members plans on a specific date?

Did you ever get an answer? We have the same issue. It seems like a no-brainer to be able to set a subscription expiry date.