Is it possible to use envoy gateway 1.1.2 as a transparent proxy before redis cluster?

*Description*:
I have a redis cluster with 3 shards (1 master per shard as the PoC). The cluster sits inside the Kubernetes where EG is installed as well. Is it possible to use the CRDs this helm chart provides to build the configuration on top of that cluster?

I expected that it would be possible with `kind: Backend` and `TCPRoute`, but no... ([ref](https://gateway.envoyproxy.io/docs/tasks/traffic/backend/))

Example [here](https://github.com/envoyproxy/gateway/blob/main/examples/redis/redis.yaml) in the repo is not useful as well.

There are no examples how to set up filters and so on.