External storage for repos (GKE installation, EE)

I am running GitlabEE under Kubernetes (Chart version: gitlab-4.5.4, Gitlab-EE version: 13.5.4).

Gitlab stores its repos in /home/git/repositories of the gitaly container of the gitaly pod. As such, it is limited by how much storage was originally assigned when the node was created.

How do I configure it to use external storage, such as an additional mounted persistent volume (which presumably I want to manage with LVM so I can extend it as needs grow), or GCP Filestore (essentially, NFS)?