Istio - Configure Log Format with Telemetry API

I am using Istio Telemetry API to generate access logs at the Istio ingress Gateway.

Here is my Yaml:

apiVersion: telemetry.istio.io/v1alpha1
kind: Telemetry
metadata:
  name: gw-access-log
  namespace: istio-system
spec:
  selector:
    matchLabels:
      app: istio-ingressgateway
  accessLogging:
    - providers:
      - name: envoy

How can I configure the access log format here?

I see no fields accepting access log format in the telemetry API as per the reference https://istio.io/latest/docs/reference/config/telemetry/