Struggling to implement chart-data for bar charts

Hi @jettro , could you please show me how to implement bar charts with categories, using dynamic chart data attribute?

I've managed to come up with this result: https://drive.google.com/file/d/0B-hbE9qIaT7kd0Q5dFVZUzkxamc/view?usp=drivesdk but failed to apply the custom axis-x custom labels. I want to show "Period 1, Period 2", Instead of 0, 1, ...

My JSON file looks like so:
`{
"cashFlow" : [{
"Period 1" : {
"Cash In" : 30,
"Cash Out" : 50
},
"Period 2" : {
"Cash In" : 60,
"Cash Out" : 50
}
}]
}`