How to add approval properties to vRA 7 External Approvals

Good day all,

Here is how the approval process is setup.

• Approval policy has a single level, and is setup to use External Approval
• The external approval workflow is called by an Event Subscription for a Pre Approval
• The vRO workflow grabs the available data from the input called payload
• The Workflow then makes the request to the external system (ServiceNow)
• The WF then polls SNOW to see if the request is approved / rejected, the completes the pre approval.

But I need to add the Number of CPU's, and Memory Size (as a minimum). 

There are only two Properties available under System Properties for the approval level.

I've tried adding VirtualMachine.CPU.Count and VirtualMachine.Memory.Size as a custom property (I also tried vSphere_Machine_1-property name). However fieldValues is never populated.

Any thoughts on how I can add those property values to the payload fieldValues?