Share permissions for azurerm_shared_image_gallery

I would like to create an azure shared image gallery with terraform that can be shared with other subscriptions.
Unfortunately, I do not see how I can do this. When I create the image gallery, there is no option to share it in terraform.
If I try to share it from the cli after creating it in terraform, I get:
Code: BadRequest
Message: The gallery ‘mysig’ is currently set to private. Please update the sharing permissions of the gallery before retrying the call.

Is there a way to share a gallery via terraform?

Answering my own question:
Sharing galleries is in Preview, so will not be available yet.