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Here is an issue tracking making those types of functions easier to use with `Input&lt;T&gt;`: <https://github.com/pulumi/pulumi/issues/5758>

In the meantime, yes, you will need to `apply` and/or `all` to project your async values into the function.

For the policy document case, there is a Pulumi-native alternative in the aws.iam.PolicyDocuemnt class. Most resources that have a policy property have type `pulumi.Input&lt;string&gt; | aws.iam.PolicyDocument`.

I don’t think that is present in all SDKs, unless it’s new. I may be mistaken though. C# particularly obviously can’t do the built in type union but they might be using their Union generic.

But if you have an Output&lt;PolicyDocument&gt; because you needed output to build the document than you’d still use the Input&lt;string&gt; I believe