How to add multiple items to the cart using CartJS ServiceNow

for (i = 0; i < 3; i++) { 
var cart = new sn_sc.CartJS();
var item =
{
'sysparm_id': '0d08837237153000158bbfc8bc2334e',
'sysparm_quantity': '1',
'variables':{
'carrier': 'mobile',
'data_plan': '500MB',
'duration': 'five_months',
'color': 'slate',
'storage': 'sixtyfour' 
}};
var cartDetails = cart.addToCart(item);
gs.info(JSON.stringify(cartDetails));
}