Grafana Dashboard Persistance without Json


I want to persistent the Grafana dashboard how can i do that without creating configmaps(like json).
Is there any method to auto persist the dashboard like when we create the dashboard it should persist .
I am using lokistack helm chart for deploying grafana and prometheus.
I have tried like creating pvc and passing existingPvc parameter in helm chart static pvc but the dashboard is not persisting.

please clarify on this?