How to add storage nodes to PowerFlex cluster using Terraform provider

We are currently working with a customer to validate the automation of PowerFlex using Terraform. Volume creation, deletion and mapping to SDC has been verified. Another important validation criteria is that the customer wants to expand PowerFlex cluster with Terraform for future demand growth.
We are wondering if it is possible to add storage nodes by modifying powerflex_resource_group? Also, is there a sample tf file for this purpose?

https://dell.github.io/terraform-docs/docs/storage/platforms/powerflex/product_guide/resources/resource_group/