Inbox Search with Variable Dates

[Erwinush]

Can a variable date be used with the Searches option? I was wondering what the syntax would be for searching yesterday's flagged messages.
With a set date, this works.
that is:detected on: 02/14/24

In Search, how would one go about using a date variable?
Ideas for an example:
the date is: mo/-1/yr, is:flagged
date: mo/-2/yr is:flagged

Before anything else, I want to thank you.