accessing ARCore and phone camera settings

Hey guys, Is there any way to adjust camera settings like exposure within unity? i dont want the phone camera adjust light/brightness by itself. its really bad for my app and i'd like to have control over it by myself. I know we can do it out of unity. But I cant write plugins. if there is no way, then how can I request it to unity team?

PS: also focusing in the area that i tapped is another useful thing to have access.