Documents about FG and LB

Hello, everyone.

I would like to build "FG-VM under LB onGCP".
I saw the documents below but I simply create that composition, not aut scaling and Terraform.
・https://docs.fortinet.com/document/fortigate-public-cloud/6.2.0/gcp-administration-guide/31327/adding-instances-to-the-protected-subnet
・https://cloud.google.com/architecture/partners/use-terraform-to-deploy-a-fortigate-ngfw

Does anyone know documents about "FG under LB on GCP"?

Regards,