pdf annotation colors?

In the current beta version (6.0) on Linux, the annotation features are excellent, but it would be very helpful to either add new highlight colors or to customize the existing ones.If there were a way to change the current hardcoded colors on a one-time basis, this would also be fine, but I could not find any settings in the config editor (and could not even see where these are implemented in the source code).Is there perhaps a workaround using the new "note templates" feature, or using some add-on?
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