Add "phantom bar"

Hi, so you want to have some additional detail ( as CAGR) for each bar in the chart? For this scenario, instead of creating card visual and aligning it to each bar, it is better to use Data Levels formatting condition for bar chart. Now Data Levels also support additional measures. Hence you can create  a measure and add in the Detail section of Data Levels.

Hope this helps to resolve your problem. If it does, please please mark it as solution.

Thanks,

Samrat