var bar_chart_data1 = [["Jan", 10], ["Feb", 8], ["Mar", 4]

how to push element in jquery like

 

var bar_chart_data1 = [["Jan", 10], ["Feb", 8], ["Mar", 4], ["Apr", 13], ["May", 17], ["Jun", 9], ["Jul", 10], ["Aug", 8], ["Sep", 4], ["Oct", 13], ["Nov", 17], ["Dec", 9]];