cinder/api-ref/source/v3/samples/consistency-group-create-from-src-request.json

{
    "consistencygroup-from-src": {
        "name": "firstcg",
        "description": "first consistency group",
        "cgsnapshot_id": "6f519a48-3183-46cf-a32f-41815f813986",
        "source_cgid": "6f519a48-3183-46cf-a32f-41815f814546",
        "user_id": "6f519a48-3183-46cf-a32f-41815f815555",
        "project_id": "6f519a48-3183-46cf-a32f-41815f814444",
        "status": "creating"
    }
}