BNG / VPDN Feature Improvement

Is there any way to group the BNG and VPDN graphs?
I'am talking about http://observium/device/device=X/tab=graphs/group=bng/

We are facing one big issue that on a Cisco ASR 9904 the active RSP is holding all PPP sessions and that the OID number is not static. So creating a Custom OID does not solve this problem.