Highlight text

Don't know if you still need it but i figured out a bit of a cheat; if you "highlight" text by inserting a rectangle shape with the color fill of your desire, size the rectangle to cover the text you want highlighted, then cut the text box and paste it back (now text will be on top of color recatngle, (depending on your highlight color and color of your text, you'll need toggle with transparency)

Hope this helps;