It was ever possible to set it in gnome-teak-tool. However, in the latest Gnome 3, it disappears. Is there any other way to set it?
The configuration is the org.gnome.desktop.wm.preferences titlebar-font under dconf.
You can use dconf-editor to find the appropriate key entry and set it.
Or use gsettings:
$ gsettings set org.gnome.desktop.wm.preferences titlebar-font 'Sans Bold 10'
To query the settings:
$ gsettings get org.gnome.desktop.wm.preferences titlebar-font
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This setting has no effect on GNOME 3.26/3.28.