manila/api-ref/source/samples/share-group-type-create-request.json

{
    "share_group_type": {
        "is_public": true,
        "group_specs": {
            "snapshot_support": true
        },
        "share_types": ["ecd11f4c-d811-4471-b656-c755c77e02ba"],
        "name": "my_new_group_type"
    }
}