[rdo-users] Creating CRUSH placement rules with TripleO

Hi everyone, Is it possible to define CRUSH placement rules and apply to different pools while using TripleO to deploy an overcloud with Ceph integration? I wish to set the "vms" pool to use SSDs and "volumes" pool to use HDDs. On a pre-existing Ceph cluster, I can define CRUSH placement rules using device-class and apply the corresponding rules when create pools. But, I don't know how to do so with TripleO. Could someone shed light on this? Best regards, Cody