Dynamic alert notification to vMan DataCenter or virtual hosts

Hi,

I use Orion to send alert notifications.  I added custom attributes to monitored nodes and utilize the attribute in alert notifications so the same alert rule will send to different recipients based on the attribute value of the nodes.

Now I have integrated vMan to Orion. Since all the vMan DataCenter and nodes are already visible in Orion, there is no need for me to add nodes to Orion manually. So how do I use custom attributes?  Is there anything I can assign at the vMan side of it so my alert notification rules may use?

Thanks