Create app.metafiled with metafieldsSet

Thank you for the suggestion. I will wait for a new version.

However one thing is still not clear to me. Even on new API version will the metafieldsSet querry is sufficient to create_or_update with such input

{
          "metafields": {
            "key": "global_settings",
            "namespace": "appname",
            "ownerId": "myappinstallationID",
            "type": "json",
            "value": "somedatainjsonformat",
}

Or should I use separate queries to check if exist Update if not Create?