Not entirely clear what you're asking. You say "VRO". Are you referring to vRealize Operations Manager? If so, that's not what "VRO" means.
From VRO, I mean vRealize Orchestrator.
I am trying to fetch used Cpu count of EXSI host through vRealize Orchestrator.
You posted in the wrong forum, in that case. The problem is, without vROps, how are you determining a "used" CPU? What does that mean?