Setup resource health alert for multiple storage accounts

Question

So the idea is to create resource health alert for multiple storage accounts using terraform. It's fairly simple for one storage account as one would pass the value

output "id" {
description = "Id of the storage account created."
value       = azurerm_storage_account.storage.id
    } 

to the resource_id or hardcode the resource id with the resource actual id. But my ask here is how I can setup one single alert block for all the storage accounts provisioned by the terraform. I have been trying to use the above data block but the name variable would take only strings. Please provide a sample example as to how you would do it.

locals {
  activity_log_alerts = {
      resource_health_alerts= {
      environment         = var.environment
      resource_group_name = var.rgp
      enabled             = "true"
     ** scopes           = module.main.storage_account_name["storage_name"] **
      alert_name     = “Resource health alert for storage accounts”
      description    = format(“The state of the azure resource is unknown”}
      category       = "ResourceHealth"
      level          = "Critical"
      operation_name = null
      resource_health = [
        {
          current  = ["Unknown"]
          previous = ["Available"]
          reason   = ["PlatformInitiated"]
        }
      ]

The error I received is this: Error: Null value found in list

scopes = tolist([var.resource_id])

UPDATE: Another Approach With this approach I was hoping to get all the resource under the same RG and subscription but got the same error

data "azurerm_subscription" "current" {

  subscription_id = var.subscription_id
}

locals {
      activity_log_alerts = {
          resource_health_alerts= {
          environment         = var.environment
          resource_group_name = var.rgp
          enabled             = "true"
          scopes             = [data.azurerm_subscription.current.id]
          alert_name     = “Resource health alert for storage accounts”
          description    = format(“The state of the azure resource is unknown”}
          category       = "ResourceHealth"
          level          = "Critical"
          operation_name = null
          resource_health = [
            {
              current  = ["Unknown"]
              previous = ["Available"]
              reason   = ["PlatformInitiated"]
            }
          ]
The error I received is this: Error: Null value found in list

scopes              = tolist([var.resource_id])