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Apparently this is as simple as defining more than 1 nodepool block

node_pools {
      availability_zones   = var.pool1.availability_zones
      count                = var.pool1.kubernetes_node_count
      enable_auto_scaling  = var.pool1.enable_auto_scaling
      name                 = var.pool1.node_pool_name
      mode                 = var.pool1.node_pool_mode
      orchestrator_version = var.pool1.kubernetes_version
      vm_size              = var.pool1.kubernetes_node_size
    }
    node_pools {
      availability_zones   = var.pool2.availability_zones
      count                = var.pool2.kubernetes_node_count
      enable_auto_scaling  = var.pool2.enable_auto_scaling
      name                 = var.pool2.node_pool_name
      mode                 = var.pool2.node_pool_mode
      orchestrator_version = var.pool2.kubernetes_version
      vm_size              = var.pool2.kubernetes_node_size
    }