WebI report Previous Quarter from Calendar Quarter field

Hi All, Need quick help in calculating previous quarter from a calendar quarter field within the report.

Calendar quarter = 2020-Q1 ; 2020-Q2 ; 2020-Q3 and so on.

Users wants to filter on "Previous Quarter" i.e. Current Quarter - 1

Let me know if there is a function within WEBI or how to calculate on reporting end without a predefined filter in Universe.

Thanks,