Apple Cider is too sweet for gravy
You can cut the apple cider with some apple cider vinegar. Adding a couple tablespoons of cider vinegar to 1 cup of apple cider should do the trick. 

You can also add a bit of mustard seed, whole or ground to give it some heat that can help combat the sweetness. I wouldn't add more than a pinch of ground mustard or a half tsp of whole seeds.

I use this exact glaze on pork roasts all the time, but I've never tried it on chicken. Let me know how it is.