GIMP at HiDPI screens

GIMP (2.10) has very small menu fonts on my screen which barely readable. I cannot found a way to increase the font size in the Preferences, how-ever editing the theme file is a easy quick fix.

For example for the 'System' theme: 

$ diff -u /usr/share/gimp/2.0/themes/System/gtkrc.orig /usr/share/gimp/2.0/themes/System/gtkrc 
--- /usr/share/gimp/2.0/themes/System/gtkrc.orig        2021-09-14 16:26:24.970000000 +0200
+++ /usr/share/gimp/2.0/themes/System/gtkrc     2021-09-14 15:57:37.440000000 +0200
@@ -38,7 +38,7 @@
 
 # Uncommenting this line allows to set a different font for GIMP.
 #
-#font_name = "sans 10"
+font_name = "sans 20"
 
   GtkPaned::handle-size             = 6
   GimpDockWindow::default-height    = 300

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