How i can use private image registry in istioctl command

HI Team,

i am trying to install the istio in my cluster with below command but how i can use the image pull secret in the command.

istioctl install -y --set unvalidatedValues.gateways.istio-ingressgateway.externalTrafficPolicy=Local --set hub=xxxxx.azurecr.io --set values.global.imagePullSecrets=acr-secret