This app was mentioned in 2 comments, with an average of 2.00 upvotes
I use beeCam and it kind of works bit isn't brilliant. Sorry for forgetting this option, I rarely use it because it seems to be a bit fuzzy.
I'm partial to https://play.google.com/store/apps/details?id=jp.co.fmbee.beecam.lightmeter&hl=en