cinder/api-ref/source/v3/samples/cgsnapshots-create-request.json

{
    "cgsnapshot": {
        "consistencygroup_id": "6f519a48-3183-46cf-a32f-41815f814546",
        "name": "firstcg",
        "description": "first consistency group",
        "status": "creating"
    }
}