Describing chart data for a bar or line series chart

jsonExample

{
    "data": [
        {
            "series": {
                "seriesID": "current",
                "values": [
                    {
                        "value": 90,
                        "info": "October Usage was 90mbtu"
                    },
                    {
                        "value": null,
                        "info": "November Usage is unavailable"
                    },
                    {
                        "value": null,
                        "info": "December Usage is unavailable"
                    },
                    {
                        "value": 89,
                        "info": "January Usage was 89mbtu"
                    }
                ]
            }
        },
        {
            "series": {
                "seriesID": "prior",
                "values": [
                    {
                        "value": 55,
                        "info": "October Usage was 55mbtu"
                    },
                    {
                        "value": 75,
                        "info": "November Usage was 75mbtu"
                    },
                    {
                        "value": 88,
                        "info": "December Usage was 88mbtu"
                    },
                    {
                        "value": 78,
                        "info": "January Usage was 78mbtu"
                    }
                ]
            }
        }
    ]
}