How to get category axis ticks to scale relative to number of visible bars rendered for that category.

[nikkorn]

Hello, I've been trying to use ChartJS to render a pseudo-timeline using a horizontal bar chart. The intention is to render these charts on the back end using the node-canvas npm package. This shows the kind of chart that I currently have https://codepen.io/nikkorn/pen/KKEJvLv

The problem I have is that I will often have to render timelines with a large amount of categories, most of the time each category will only have a single bar, but in some cases they may have a large number of bars, and ChartJS seems to give each category an equal amount of the available horizontal space in the canvas.

I don't want to have to render massively tall charts just to cater for edge cases where a few categories may have more visible bars. I'm actually after something that scales a little better to fit to the bars shown, as shown in this mockup:
I haven't had much luck digging through the documentation and I can't seem to find a plugin which does the trick.

I've also set an explicit bar thickness to make it easier to calculate a figure to use as the canvas height.

If anyone has a solution it would be greatly appreciated. Thanks