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Was able to figure it out using project binding, in case anyone else needs it (python):
```firestore_iam = gcp.projects.IAMBinding(
    resource_name="firestore-binding",
    project=project,
    role="roles/datastore.owner",
    members=[gcp_sa.email.apply(lambda email: f"serviceAccount:{email}")],
    opts=pulumi.ResourceOptions(provider=gcp_provider),
)```