This might seem like a lot of work, but what I've found works is to copy your text from Tapas (you will have to do so in Tapas' text editor) and paste it back into a temporary new document in Word. Then, in Word, select all of your text. Then reselect your font, reselect your font size, reselect your alignment (left, center, right, or kearning), reselect your line spacing. Once you've done this, reselect everything again, hit CTRL+C, then return to the Tapas text editor. Your text should still be highlighted from your first step. Hit CTRL+V and your newly formatted text should replace what is there.
You will not be able to import font, font colour, or font size, but your style should transfer over.