How to enable fractional scaling of GTK apps in KDE Plasma?

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While Plasma supports fractional scaling of Qt apps very well, the fractional scaling does not apply on GTK apps.

GDK_SCALE=2 appname can apply a scale factor 2, but it does not work for fractional scaling.

Is there any way to apply fractional scaling on GTK apps running on KDE Plasma? I am using Plasma 5.22.5 in Kubuntu 21.10.


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