You can create the necessary infra in the policy API, but to have PKS continue to create objects there requires modifying the NCP configuration file. As part of Enterprise PKS, I do not know if such a change would be supported. If rolling your own by deploying the NCP into other K8s clusters, you would just make the modification in the ConfigMap.
The only supported way is Advanced UI (Manager API) now.
Based on information in NSX-T Reference Guide and next fragments on the webs it can be expected that PKS will support the PoliceAPI over time as well.
And next the VMware recommended to use Simplified UI.
Related problem solved here: PKS Kubernetes Network Policy and NSX-T Firewall rules sequence problem