You can integrate the OpenShift cluster you created with Antrea as the CNI with NSX-T. The integration can be done at any time after the cluster is created.
For more information, see https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/administration/GUID-9197EF8A-7998-4D1B-B968-067007C56B5C.html.