apiVersion: v1
kind: Secret
metadata:
  name: name
  namespace: default

data:
  key1: c2VjcmV0X2RhdGEx
  key2: c2VjcmV0X2RhdGEy

---
apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: test-secret
  namespace: default

spec:
  plugin:
    test-secret:
      secret:
        - urn:k8s:secret:name:key1
        - urn:k8s:secret:name:key2