@pancake No, sorry. I can file a feature request for you but it's probably not that useful anyway due to the way pagination works.

You can only request N<=100(?) amount of users per page and you'd have to get all pages to search on all of them (which can be *a lot* of requests if the user follows thousands). There's no API that allows you to search on someone's followers/ings server-side as far as I am aware.