Is there some way to prevent text wrapping of long headers with no spaces in the data table of a chart?

I was hoping to find a "Shrink to fit" feature, like the one that can be applied to cell values, or a way to display the text vertically, i.e. with a custom angle. However, the Alignment tab is not available in the "Format Data Table" dialog. Other suggestions are also welcome.

The text in the first three columns in this example should not be wrapped, the others are OK.

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