Terraform Support for Google Cloud Redis cluster Maintenance Window

I am not so sure if I am posting this in the right place. I apologise if I am not. I am new on this forum but a long time terraform user.

We have our GCP Redis cluster in terraform version 0.12.31. We have manually applied maintenance window for these clusters but we now want to put this in terraform. I can’t find a way get this done. The information that are available on
https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/redis_instance and https://cloud.google.com/memorystore/docs/redis/reference/rest/v1beta1/projects.locations.instances#Instance.FIELDS.redis_configs only seems to apply to traditional on-prem redis cluster. Is it possible to apply this GCP redis feature in terraform at this time?

I created gcp redis instance manually with maintenance window enabled. When I imported it with terraformer, the maintenace windows was not present. Its the only feature that is absent. How soon can one expect this GCP functionality in terraform?