Is there a way to remove grafts after an eyebrow transplantation?

Unless you remove them NOW, it is permanent. You can pluck the eyebrows  you don't like. If you do this enough it will not grow back.

At 10 days, many of the hairs have healed (but certainly not all). In general, the most important thing for anyone who wants to remove transplanted hairs is to speak to their surgeon. I suspect that some transplants hairs would still grow back even if plucked out now.  With each passing day there is less and less chance that plucking transplanted hairs will have any effect. See your surgeon as soon as possible

Yes, you can pick them out and about this time they may not come back. Picking out eyebrow hair consistently will eventually produce loss of the particular eyebrow hair.