Hi ! How do I create an IP address with purpose

SHARED_LOADBALANCER_VIP

? I am using it like this:

new gcp.compute.Address("myip", {
    project,
    addressType: 'INTERNAL',
    subnetwork: subnet.selfLink,
    labels,
    region:'europe-west1',
    purpose: 'SHARED_LOADBALANCER_VIP'
});

but which fails with the error :

has a problem: expected purpose to be one of [GCE_ENDPOINT ], got SHARED_LOADBALANCER_VIP