The actions, e.g. “Keep screen on” are to be specified in a “Profile” of your choice, e.g. create a new, empty one.

To apply this “Profile” based on the app and battery level, you have two options:

Either create an empty “Event” where you specify both, battery level and foreground app (application sensor).

Or: Create an Event for the app with medium priority and assign a high priority to the standard “battery low” event, e.g. 10.