Just open engine.cfg with a text editor and add the strings you want, like:
[platform.android]
version="0.1"
code_version="2.0"
Then, in game, you can access those using Globals.get("platform.android/version") and Globals.get("platform.android/code_version").
Of course you can name the section and the keys however you want, just treat it like a normal .cfg file.
(Sorry for the quote tag instead of the code one, but I don't know what is the code for multiline code)
