I don't believe so, though if you just want to show position, you can create a token with a transparent png image, set a 1 square Aura around it (not visible to others), and set the controlled by property to that player so they will see the aura. If you just want to show them what it looks like, you might be able to use Z to bring the picture up, right click to copy the image address, and whisper the image to them?