RBAC for istio egress gateway

We are currently using isito egress gateway for reaching internet. But the problem is all the services in the namespace are able to use egress gateway to reach internet. Is there a way I can mention only a particular service can reach istio egress gateway.

We have open-sourced an example repository which (among others) has a solution to restrict specific applications to reach an egress gateway. For more details, check out the related blog post.