Terraform 循環遍歷 2 個元組

在下面的 terraform 代碼中，我試圖用單個塊創建組。現在我使用 0,1 2 個單獨的塊來創建。有沒有其他方法可以用單個塊創建組。我試過 flatten 但沒有運氣

    locals {
      instances = [
        {
          instance  = "test1"
          baseUrl   = "url"
          subDomain = "sd"
          groups = [
            "app1",
            "app2",
        "app3",
      ]
},
    {
      instance  = "test2"
      baseUrl   = "url2"
      subDomain = "sd2"
      groups = [
        "t1",
        "t2",
        "t3",
      ]
},
  ]
}
resource "okta_group" "press" {
  for_each = { for k, instance in local.instances[0].groups : k => instance ]
  name     = each.value
}
resource "okta_group" "press1" {
  for_each = { for k, instance in local.instances[1].groups : k => instance ]
  name     = each.value
}