来自单独Terraform项目中的模块的参考模块

Question

Terraform是否可以具有如下目录结构：

├── environments
│   └── production
│       ├── app1
│           ├── instances.tf
│       ├── app2
│       └── shared
│           ├── iam.tf
│           └── security_groups.tf
└── modules
    └── iam
    └── node

environments/production/{app1, app2, shared}各自具有自己的地形状态，并且彼此独立。但是，从app1和app2中，我需要从共享中引用模块输出变量，例如安全组，IAM等。

所以environments/production/shared/iam.tf看起来像：

module "iam" {
    source = "../../../modules/iam"
    var1 = "foo"
    var2 = "bar"
    var3 = "car"
    var4 = "nar"
}

然后如何从app1或app2引用iam中shared的实例？

environments/production/app1/instances.tf：

module "app1" {
    source = "../../../modules/node"
    iam_profile_id = { how do I reference the IAM module from shared here?
    // shared.module.iam.profile_id?
}