Installing Loki with Helm and Ceph backend

I’m trying to get the new helm chart working with a Ceph backend and having a hard time. We are currently on an old loki-distributed and wanted to upgrade but looks like a new install is better route BUT we cant get the new grafana/loki chart to work with Ceph. Anyone have the minimum values to get the cluster started using Ceph as the s3 backend?

Following, looking to do something similar.