wp-base-chart/www-example-com/templates/pvc.yaml

{{- if .Values.storage.create }}
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: {{ include "chart.fullname" . }}-pvc
  namespace: {{ include "chart.namespace" . }}
spec:
  accessModes:
    - {{ .Values.storage.accessMode }}
  storageClassName: {{ .Values.storage.class }}
  resources:
    requests:
      storage: {{ .Values.storage.size }}
{{- end }}