Currently in 4.11, MAPI nutanix machine-controller does not provide the machine (VM)’s instance-type, region, zone, etc. labels to the Machine CR. And these columns are empty when viewing the Machine CRs, via cli “oc get Machine” or from the OCP cluster web console. 
$ oc -n openshift-machine-api get machine 
NAME                                  PHASE      TYPE REGION ZONE   AGE 
demo-ocp-cluster-g1-77nws-master-0   Running                        133m 
demo-ocp-cluster-g1-77nws-master-1   Running                        133m 
demo-ocp-cluster-g1-77nws-master-2   Running                        133m 
demo-ocp-cluster-g1-77nws-worker-2bsxn Running                      129m 
demo-ocp-cluster-g1-77nws-worker-75hr5 Running                      129m 
demo-ocp-cluster-g1-77nws-worker-rg7b9 Running                      129m

We can add something like the below labels to the Machine CR in the mapi-nutanix when reconciling for the Machine CRs: 
machine.openshift.io/instance-type: AHV 
machine.openshift.io/region: <prism-central-address> 
machine.openshift.io/zone: <prism-element-name/uuid>

run cli “oc get Machine” or from the OCP cluster web console to view the Machines resource

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The "Type", "Region", "Zone" columns are empty for each Machine CR.

The "Type", "Region", "Zone" columns showing data for each Machine CR.