"Days since" habit tracking

I would like to have a habit tracker option for those habits that are flexible but have an overall time frequency. For example, “planning a date with my partner” every two weeks. I would like to have the soft reminder to plan something every two weeks, but it wont always be every other friday. So my idea would be to have a habit set up as days since last date intead of just poping up on the exact date that needs to be done. So that when the habit is close to “expiring” say ten days since last date. Then it would pop up on the dashboard screen as a soft reminder, but then if it has been more than the established frequency if would turn red and keep on counting as days late, as a constant reminder to schedule something.

It would be great to configure the frequency and reminder thresholds so longer habits dont spam you earlier. For example “Going to the dentist” set every 6 months with reminder at one week from expiring.