I think the HEX is expected, so it can be used accordingly. Not sure what benefit a "Coloured element (square, circle, whatever)" would be.
The tutorial is in German, but maybe you can Google translate it
Thank you for the replies.
I was hoping to integrate that in the core, since a hex. code does not mean a lot to a regular user.
I can prepare a PR, if it has chances to get merged.
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a coloured element does not make much sense in a generic way
Still do not understand how the hexademical code makes more sense, than the visual color.