Checkout this API:https://code.vmware.com/apis/424/vra-ipam#!/requests/createRequest
vRealize Automation IPAM Service API - VMware API Explorer - VMware {code}
It should be usable from vRO vCAFE library, at least I found this one var myvCACCAFEIpamRoutedNetworkProfile = new vCACCAFEIpamRoutedNetworkProfile() ;
I did not find the appropriate client (vCAFEHost.getClientxxxx), but I'm confident, that this is possible.
Best
Daniel