(This is used to request new product features, please visit https://discuss.istio.io for questions on using Istio)

Describe the feature request

Currently, we rely on HTTP Proxy configuration on Istio by setting the parameter proxyHttpPort since we are creating a non-transparent mesh. This configuration adds another listener, but this listener cannot be altered by the EnvoyFilter, so it is not possible to tweak the listener configuration.
This functionality is referred as a TODO in the code.

Affected product area (please put an X in all that apply)

[ ] Docs
[ ] Installation
[X] Networking
[ ] Performance and Scalability
[ ] Extensions and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience
[ ] Developer Infrastructure

Affected features (please put an X in all that apply)

[ ] Multi Cluster
[ ] Virtual Machine
[ ] Multi Control Plane

Additional context