How to use set_filter for listing all fonts of perticular language for Gtk.FontDialogButton

Here, how to set Gtk.Filter for ‘ja’ language
self.label_jft = Gtk.Label(label="乇乂丅尺卂 丅卄工匚匚 ")
font_dialog = Gtk.FontDialog()
self.font_button_dialog = Gtk.FontDialogButton.new(dialog=font_dialog)
pl = Pango.language_from_string(‘Japanese’)
font_filter = Gtk.Filter()
font_dialog.set_filter(font_filter)
self.vbox.append(self.label_jft) self.vbox.append(self.font_button_dialog)

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