More options for "send email once in [X] days"

We'd like more options in the "Send email once in [x] days" setting under JO outreaches.  Can we add an option for once every 6 months, or once a year?  I'm setting up a QBR survey and don't necessarily want to send it after EVERY quarterly business review, but more like once a year, and there are no options between 90 days and lifetime.