According to new code analysed by 9to5Mac, Apple is working towards making it easier to change the iPad keyboard brightness. Reportedly, a beta version of iPadOS 13.5.5 has references to keyboard shortcuts which can affect the backlight brightness and the iPad screen.
Apples' new iPad Pro Magic Keyboard is a great solution for iPad power users in many respects but the company continues to reject a function row on itsiPad keys. For example, you currently have to delve multiple levels in the Settings app to change the brightness of the backlighting keyboard.
9to5Mac couldn't use the keyboard shortcuts for this beta software in fact, so it may not be possible for them to ship until a later iPadOS 13 version or even 14 is installed. Apple at least seems to have realized that this is less than an ideal scenario.