Filtering for entitlements having specific action_name

Hi All,

I want to filter an entitlement table field list for entitlements which have a specific action name. In the entitlement rule filter I did not find a built-in option to select. I have also tried these (checking only existence as a POC):

x."Action name" is not null

and

x.action_name is not null

without success. Do you have any idea if it is possible? Maybe any information which table or view is the basis of this query?

Regards,

Zoltan