Allow Certain User groups in Sharepoint DLP policy

Hi,

We want to allow User group A and block all other groups in a sharepoint policy. The policy is to be applied on label "Confidential". In DLP for Sharepoint Policy, I can see the option of document created by but there is no option for "Recipient is member of distribution group" so I am unable to exclude User Group A.

Can anyone guide, how we can achieve the above?

Thanks

Fahad.