How to compute the IBPL multivalued in the Integrity report/chart ?

Looking for a computation for the IBPL attribute for the multivalued. 

Variant IBPL is a IBPL attribute,

Example IBPL pick values are RED, GREEN, BLACK etc

REQ 1 -- RED

REQ 2 -- RED, GREEN

REQ 3 -- RED, GREEN

REQ 4 -- BLACK

How to find the Req's count having IBPL values RED;GREEN. IBPL types are in the Playground project, I used to follow below computation but its not working for multiple values.

aggregate("Contains", ByDocument(false, false), sum((Category="Requirement" and "Variant IBPL"=="RED:/Playground;GREEN:/Playground")?1:0))