Hello Chris, and welcome to iMore!
There is no setting that I know of in iOS. The feature you want has to be added by the app developer themselves. I have one that does it called OurGroceries (syncs custom lists between the app on your phone and on your partners phone). It's handy to have the screen forced to stay on
sometimes, but the dummy developer did not add an option in the app to disable it.
If you want this type of feature you'll have to
request it from Apple, or from specific app developers.