Allow use of "in past before" or "in future after" for date constraints

I have challenges where I want to create a smart list with date constraints, but because it does not allow me to use "in past before" or "in future after" in the date constraint section, I have to manually adjust that every month instead of automating it.

for example, I want to create a smart list of people who filled out a form in past before 2 months. To accomplish this I have to do "or or before" and set a specific date, and every 30 days, go back and update the date. The fact that I can't say "filled out a form in past before 2 months" and have to constantly go back and update the date is silly and frustrating.