No, Khamake expects .ttf files for fonts (source), unless of course you write a .dat file reader that can convert the file contents into a kha.Font object.
FeathersUI is for OpenFL and not for Kha, so it will not work with Armory unless you rewrite a lot of it. Btw, if you use Armory2D, you already use Zui even though Armory just calls it a “Canvas” (regarding the discussion above).