Cornerstone charts and decimal places

I now have my first project where I want to use Cornerstone Charts. My problem is that the dynamic data is in European decimal style, i.e. (1.234,12).
However, Cornerstone Charts only seems to work with the dot format (1,234.12). Is there a “hidden” option to solve this without having to go through a custom provider?

The display itself in the axis seems to be correct again with a comma as decimal separator.