Actual Exposure View on iPhone

When i change the exposure (iso, shutter etc) i would like the screen im viewing on to match the expected under or over exposure. For example, If i set it to 54 iso and 1/60 shutter it really feels like the phone’s display settings is battling me to see my expected exposure beore i hit the shutter button, and the phone is darker than expected. I would love the app to comunnictae with the phone’s settings ap the viewfinder changes to be more accurate to the photo’s setting