Automating bulk import of Unmanaged VMs

I would like to create a vRO workflow(s) that will automatically get all "unmanaged" VMs from vRA and ingest those into vRA.  I DO NOT want to use the bulk import vRA feature and can not use other tools.  I am successful in creating the spread sheet of the VMs with the properties needed, but how would I import all those VMs using vRO API calls.  Could not find any calls in vRO library API.  Can anyone help?  Ideally the workflow I create will not have any inputs, gets all unmanaged VMs and import those into vRA.