[magnum] security groups for magnum nodes

Is there an option for adding security groups to a given magnum template, and thus the nodes that such a template would create?

I have an NFS server, and it is setup to only allow connections from nodes with the "nfs" security group. A few pods in my cluster mount the NFS server, and are blocked as a result. Is it possible to setup magnum so that it adds the "nfs" security group to the worker nodes (it would be alright if it has to be worker and control nodes)?

Thank you!