Javascript + Chartkick multiple data sets or grouping -

i hava dataset this:

companyname customareacode  salesmonth01    salesmonth02    salesmonth03 company1    aa1a            20              30              40 company1    aa1b            23              32              43 company2    aa1a            23              42              45 company2    aa1b            87              65              98 

i using javascript ant charkick. want make chart have sales on y axis, , there salesmonth on x axis, grouped customareacode. final chart should 1 in example (sorry painting skills):

my code create chart:

new chartkick.columnchart(chartname, chartdataitem, {  "library": { "backgroundcolor": "#ffffff", "haxis": { "title" : xtitle }, "vaxis": { "title" : ytitle, "viewwindow": { "min": chartmin3, "max": chartmax3 } } }, "discrete": true, "colors": ["#82aef5", "#484c57", "#9987f6", "#ffe57b", "#ffcf7b", "#ffb07b"]}); 

data json have @ moment (don't know put area code):

[     {         "name":"company1",         "data":             {                 "2015-01":20,                 "2015-02":30,                 "2015-03":40             }     },     {         "name":"company2",         "data":             {                 "2015-01":23,                 "2015-02":32,                 "2015-03":43             }     },     {         "name":"company1",         "data":             {                 "2015-01":23,                 "2015-02":42,                 "2015-03":45             }     },     {         "name":"company2",         "data":             {                 "2015-01":87,                 "2015-02":65,                 "2015-03":98             }     } ]