Installing two gateway ingresses with one being an ilb on AWS

It looks as through I can install two gateways, one of which would be an ilb. [https://github.com/istio/istio/issues/20033]

But it is not clear to me how I would do this using the istioctl. In the end I want to ingresses one of which is an internal LB.

https://istio.io/docs/setup/install/istioctl/#configure-gateways should help, it covers both ILB and multiple GWs.