Support for 'ungrouped data' having coloumns and rows properties separately

Would you be interested in supporting the following format for data ? I'm doing it for my project and thought that you might be interested.

```
var chart = c3.generate({
data: {
items: {
cols: ['data1', 'data2', 'data3'],
rows: [
[90, 120, 300],
[40, 160, 240],
[50, 200, 290],
[120, 160, 230],
[80, 130, 300],
[90, 220, 320]
]
}
}
})
```