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`aws.sns.TopicSubscription` is where I started my search, but the problem with it is that `aws.sns.TopicSubscriptionArgs.topic` is required to be of type `pulumi.Input&lt;aws.sns.Topic&gt;`. Right now I am wishing it could be of type `pulumi.Input&lt;aws.sns.Topic | aws.ARN&gt;`.

i think you could do this by doing aws.sns.Topic.get

to create a pulumi resource instance for an existing aws topic

you can then subscribe to a lambda off of that topic

It seems that that first argument, `name`, is arbitrary. The second arg, `id`, would be the ARN. But I'm getting an error: `InvalidParameter: Invalid parameter: TopicArn`. I suspect that I need to provide a custom provider to `aws.sns.Topic.get()` because the topic is in a different region.

First result: Using `aws.sns.Topic.get()` works when the topic is found in the same region as the stack's default.

Final result: It works across regions, as long as an `aws.Provider` representing the foreign region is supplied to both `aws.sns.Topic.get()` and `new aws.sns.TopicSubscription()`.