Can you clarify what you’re trying to do?
Do you want to set up your k8s cluster so that it can provision storage as needed for k8s workloads deployed by Juju to the cluster? If so, you don’t need to create any Juju storage pools to use k8s provisioned storage with Juju. You can if you need advanced options, but all you need in most cases is simple to have a default Storage Class in your cluster. When running juju add-k8s, this default storage class will be used to set the workload-storage model config attribute and will be used as needed.
Or are you asking about how to set up the Storage Class itself with a suitable provisioner on MAAS?