API Latency using Istio Ingress

Hey there,
Am using EKS & Istio ingress only and not using Envoy at all.
Is there any way possible I can Get API latency through Istio Ingress ?
Is it mandatory to use Envoy if I want to go for API Latency metrics ?
If yes, I can at max place it at BFF layer, would that be sufficient ?

Request a quick response if possible.

Seems we can enable additional metrics at proxy level using annotations as mentioned on this link – Istio / Envoy Statistics.
Have someone already implemented this ? Please share sample YAML.