Deploy Vault to GCP using GCE in 2 regions

Terraform
1

I want to deploy Vault in HA mode on GCP. My current setup I use below GitHub repo. It quite shortened my work. I use INTERNAL load balancing.

How can i use same Terraform repo but deploy VMs in 2 regions and it is accessible only privately? can I make it with INTERNAL load balancing?

here is my typical module configuration.

module "vault" {
  source                    = "terraform-google-modules/vault/google"
  project_id                = var.project_id
  region                    = var.region
  kms_keyring               = var.kms_keyring
  kms_crypto_key            = var.kms_crypto_key
  vault_machine_type        = var.machine_type
  vault_max_num_servers     = var.vault_max_num_servers
  vault_min_num_servers     = var.vault_min_num_servers
  vault_version             = var.vault_version
  vault_instance_base_image = var.vault_instance_base_image
  vault_allowed_cidrs       = [ "X.X.X.X/32" ] # vpn-public-ip
  load_balancing_scheme     = "INTERNAL"
}

it is currently deploys the vms on the same region different AZs. I want 1 VM in one region, the other in another region.