How to create new local storage class in juju (on-premises)?

Hello everyone, we jave juju k8s installed on our on-premises server (1 physical box with 1 k8s master and 1 worker).
One of the software we want to install on top of k8s refers to a storage class but we don’t have any storage class on this k8s cluster.
How do I create a new Storage Class on this k8s using local disks only ?