It is certainly possible to achieve this - and even animate the arrow.
But I don't think it is there out of the box.
I can think of two ways of achieving this.
The best and most flexible way is to create the arrow as a generator in Motion 5 - if you have it. Then it will be there for you to use anytime you like in FCP X.
I'm a complete newbie in Motion, but I was able to create an arrow in Motion in maybe 3 minutes; then in FCP X I am able to change its color, size, opacity, rotation, position, adding keyframes to animate it if necessary - so, say, the arrow comes in from the side of the frame, or pulses, or whatnot.
Even if you don't have Motion, you may get a generator somewhere from the web. Otherwise, you may create the arrow as a still image in a graphics program. Just make sure it has a transparent background (not white or black), so that you can place it on top of your video and not obscure it.