These are the now-unmaintained KDE Plasma Oxygen fonts, that are still widely used as webfonts.
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^ you can drop my name here
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^ as you are using the kde-plasma CATEGORY (to fetch), the pkg is called plasma5-oxygen-fonts-5.4.3, i.e. it gets the PKGNAMEPREFIX plasma5-
As it is no longer part of plasma5, I would suggest you add