Would it be possible to add an (external) mic-is-in-use LED to a phone? I belive the mic needs power to work. It wouldn't/shoudn't be powered unless it is in u

Would it be possible to add an (external) mic-is-in-use LED to a phone? I belive the mic needs power to work. It wouldn't/shoudn't be powered unless it is in use. Could it also power a LED without affecting the mic performance?