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You should be able to wrap the `get` itself within an apply, e.g.
```policyData = serviceAccount.email.apply(email =&gt;
    gcp.organizations.getIAMPolicy(...))```
(policyData will now be an `Output&lt;GetIAMPolicyResult&gt;` which you can use elsewhere

well, I need to add another service account from another property. How can I do it with this solution?

```const policyData = serviceAccount.email.apply(email =&gt;
  gcp.organizations.getIAMPolicy({
    bindings: [
      {
        role: "roles/storage.admin",
        members: [
          "serviceAccount:" + email,
          "serviceAccount:" + gcpServiceAccount
        ]
      }
    ]
  })
);

const bucketPolicy = new gcp.storage.BucketIAMPolicy("velero", {
  bucket: bucket.id,
  policyData: policyData.policyData
});```

You can use `pulumi.all` — you might want to take a look at <https://www.pulumi.com/docs/intro/concepts/programming-model/#outputs> if you haven’t already

I stumbled upon `pulumi.all` in the unit tests documentation today Will try

Not sure if I am using correctly:
```const policyData = pulumi
  .all([serviceAccount.email, gcpServiceAccount])
  .apply(([veleroServiceAccount, gcpServiceAccount]) =&gt; {
    gcp.organizations.getIAMPolicy({
      bindings: [
        {
          role: "roles/storage.admin",
          members: [
            "serviceAccount:" + veleroServiceAccount,
            "serviceAccount:" + gcpServiceAccount
          ]
        }
      ]
    });
  });```
But now policyData is an instance of  `pulumi.OutputInstance&lt;void&gt;` and not `Output&lt;GetIAMPolicyResult&gt;`

The compiler sees `=&gt; { … }` as a void function. You should remove that extra set of braces and it should give you back what you want.