manjaro – Hide Window Title Text (Gnome 43)

How can I change the text color on window title bars, in Gnome? The text usually indicates the application’s name and I need to hide it.
Giving it the titlebar’s background color should be enough, but I can’t find where to do it.

I’m in Manjaro Gnome 43. The window title I want to particularly hide is Blender’s (a non GTK app), but the idea is to hide it for all applications.

Before
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After
enter image description here

PD: I tried modifying the gtk.css file without success so far. I searched also in the metacity*.xml file of an installed theme but there are no colorcode references.

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