Access K8s Secrets from Istio

Security
1

I have the following

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: vecho-get
  namespace: vadal
spec:
  selector:
    matchLabels:
      app: vecho
      action: ALLOW
  rules:
  - to:
    - operation:
        methods: ["GET"]
    when:
      - key: request.headers[x-vadal-key]
        values: ["secret"]

Is there anyway to store “secret” somewhere common such as in K8s/Configuration/Secrets and then reference it here.

Many thanks.