Using generator (`function*`) as data providers

Is this possible?

``` js
var chart = c3.generate({
data: {
columns: [
['data2', 200, 130, 90, 240, 130, 220],
['data3', 300, 200, 160, 400, 250, 250],
['data1', 30, 20, 50, 40, 60, 50],
(function () {var i=0; var ar = ["lab", 1,2,3]; return function*() {yield ar[i++];}})()
]
}
});
```

based on http://c3js.org/samples/data_columned.html