i’m fairly sure you can’t
there’s no text color reference in the inc_rv_home_menu_node.xml
And i should say a WARNING about tinkering with this file … (speaking from experience)
If you try modifying it (editing or adding text color code) … the WDTV may not like it, and you’ll find yourself in a “Crash” 1st followed by a “Endless Boot Loop” after applying the theme.
For the WDTV Live Hub to “recover” (My very 1st on this Forum)
http://community.wd.com/t5/WD-TV-Themes/Be-Carefull-Editing-Home-XML-S/td-p/146450
I think, the Live Streaming and the 2014 Media … you have to press the “reset hole”