Terraform -如果在for_each中。我可以过滤for_each吗？

variable "instances" {
  type = map(string)
  default = {
    instance1 = "web"
    instance2 = "db"
    instance3 = "cache"
  }
}

resource "aws_instance" "example" {
  for_each = var.instances

  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"

  dynamic "tags" {
    for_each = var.instances

    content {
      key   = tags.key
      value = tags.value

      # 过滤条件示例：只创建带有特定标签的实例
      lifecycle {
        create_before_destroy = true
        ignore_changes        = [tags]
      }

      # 其他资源属性配置...
    }
  }
}