Active directory retrieve memberof group CN

There is one use case I'm thinking of that would require the group to be only the first CN value: SAML multi-value attribute (unfortunately not working properly yet due to the fact that APM won't split the group list in multiple value fields). In such case one wouldn't probably like to send the DN but only the first CN field value.

An option to retrieve the groups in such format or an additional variable in such format would be appreciated :-)

Alex