kennethic,
You can store in
localstorage whatever you want, in whatever format you want. Actually, this is a question for some guru guys from
localstorage, we provide support only for the Highcharts part, but I can help you a little bit. For example, you can store an object converted to a string and after reading it from
localstorage parse it properly like in this demo:
https://jsfiddle.net/BlackLabel/3268cpms/
Or you can store each value individually and read them also individually.
Regards!