I'm not sure. I know the males have a few hairstyles where there ears will have black spots and/or dots, but they're locked to a few hairstyles, and you can't switch them up either. I believe their was one hairstyle that changed the ear colour to your highlight's colour. Can't say for certain if the females have that at all as I have not made a female Miqo'te.

And I honestly doubt they'll add it either. I'm all for it, as more customization is always welcome in my opinion, but we'll probably hear something about "Server Limitations" or "Character Creation Limitations" again if they were asked to add something like this.
I'm not getting my hopes up, but colour me surprised if they did add it.