Retry option in Istio 503: Istio 1.3.4

Hi Team,

I understand that we can configure retries in Istio using the below

retries:
  attempts: 3
  perTryTimeout: 2s
  retryOn: gateway-error,connect-failure,5xx

But, just want to understand if there is a way to retry on 503 for specific http method

Thanks in advance