Subbing Coconut Milk into a Chocolate Chip Cookie Mix?

Is this possible? Google isn't helping me much. But, I read somewhere that I guess in lieu of butter and eggs, you could use coconut milk? Now, I'm home from the store with no butter, yes to eggs and yes to a can of lite coconut milk - is this possible? Haha. My Whole Foods mix calls for 1 egg and 5 T of softened butter. Any help would be majorly appreciated! Thanks!