I was just playing around with the bar chart extension creation using Dev Hub and chart template but the problem is I am only getting 1 dimension and 1 measure. If also I am increasing the max values for measures and dimensions I am able to add more expression but it is not showing in the bar graph. only it is showing the first measures.
Assuming you had a previous version with qWidth: 2 in qInitialDataFetch you probably just need to drop the extension object from the sheet and create a new one. Increasing qWidth will only affect new charts, not the existing ones.
And you are running the latest extension version and not an older one from the browser cache?? I have wriiten a small document on troubleshooting your extension, check it out Troubleshooting your extension