If I understand the problem here, you want to show the text that is visible on the bar should be transformed from (37.33) to (37, 33) likewise.
For this, you need to change the showcasing of data by converting the decimal to string and replacing the “.” to “,”. which will help to solve your problem. I hope you are using Any charts for rendering the charts. Because something similar to your requirement we have tried.
Have a look at this documentation page: https://docs.mendix.com/refguide/parse-and-format-decimal-function-calls/
This will help you format your decimal number to any visualization you like.