How to set the PowerShell stack in an Function app by Terraform ?

I succesfully provisioned a Azure Function App by terraform. How can I define that the Azure Function App should be of Stack "PowerShell"?

This is my current Terraform code:

resource "azurerm_storage_account" "storageAccount" {
  name                     = "funcappterformpocm365"
  resource_group_name      = data.azurerm_resource_group.this.name
  location                 = var.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
}

resource "azurerm_app_service_plan" "functionApp" {
  name                = "azure-functions-test-service-plan"
  location            = var.location
  resource_group_name = data.azurerm_resource_group.this.name

  sku {
    tier = "Standard"
    size = "S1"
  }
}

resource "azurerm_function_app" "example" {
  name                       = "az-func-app-terform-poc-m365"
  location                   = var.location
  resource_group_name        = data.azurerm_resource_group.this.name
  app_service_plan_id        = azurerm_app_service_plan.functionApp.id
  storage_account_name       = azurerm_storage_account.storageAccount.name
  storage_account_access_key = azurerm_storage_account.storageAccount.primary_access_key
  depends_on = [azurerm_storage_account.storageAccount, azurerm_app_service_plan.functionApp]
}