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

Describe the feature request

for current implementation, we can use command istioctl x workload group to generate the Yaml of WorkloadGroup CustomResource definition. however, the network parameter is not supported yet.

Describe alternatives you've considered

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

[ ] Ambient
[ ] Docs
[ ] Dual Stack
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Extensions and Telemetry
[ ] Security
[ ] Test and Release
[x] User Experience
[ ] Developer Infrastructure

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

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

Additional context

i'd like to raise a PR to add this parameter