Ah sorry, I think I have misunderstood the question - I thought you meant adding a visual element like a grid e.g. Croppie - element plugin to crop and zoom images before upload - #96 by luke2 I follow now.
Yes, exactly as Nigel has rightly pointed out, there are only circle and square cropped viewports:
With that said, you could use Imgix on the result image to crop around the face e.g.
But unfortunately this wouldnt interactive initially with Croppie.
Tricky one…