jqplot widget using historical data?

[MacSass]

Hi,
I really like those charts - but I´m looking for a way to use this with "historical data" coming from a JSON (or CSV, I don´t care).

Use case:
I have a URL that provides a JSON file that always has the latest 2 hours of temperature data (including time stamps). I would like to get that data charted right away when the dashboard is loaded.
Also, it should poll the JSON periodically to get the latest data and update the chart with it.

Freeboard is great - but it really focusses on real time data and I would like some historical data and can´t get that to work ...

An example how to do that would be highly appreciated, I´m getting confused by your chart data item needing something like [[1,2],[3,4]] - why the double bracket.
Could I add a Javascript snippet here that pulls the JSON via AJAX and pushed the array to jqplot?

Thanks - MacSass