I'm trying to create a new cluster in Databricks on Azure using databricks-cli.

I'm using the following command:

databricks clusters create --json '{ "cluster_name": "template2", "spark_version": "4.1.x-scala2.11" }'

And getting back this error: 

Error: {"error_code":"INVALID_PARAMETER_VALUE","message":"Missing required field: size"}

I can't find documentation on this issue, would be happy to receive some help.