Not yet 😞
It should not be complex to implement,
The actual aws auto scaler class is implementing just two functions:

def spin_up_worker(self, resource, worker_id_prefix, queue_name):
https://github.com/allegroai/clearml/blob/e9f8fc949db7f82b6a6f1c1ca64f94347196f4c0/clearml/automation/auto_scaler.py#L104

def spin_down_worker(self, instance_id):
https://github.com/allegroai/clearml/blob/e9f8fc949db7f82b6a6f1c1ca64f94347196f4c0/clearml/automation/auto_scaler.py#L118

We just need to have the equivalent for gcloud and it should work

Here is the full aws as a refrence
https://github.com/allegroai/clearml/blob/e9f8fc949db7f82b6a6f1c1ca64f94347196f4c0/clearml/automation/aws_auto_scaler.py#L22

Do you feel like taking a stab at it ?