Android/Java: How to get Targets & Macros in Android like in iOS?

Question

I would like to create targets & macros like in iOS on the Android side.
I read the doc but impossible to understand

1/ how to get targets/schemes like in iOS:

2/ how to get preprocessor macros like in iOS:

I also checked that ticket and that ticket but it never mentions how to create the macros part and how to compile the differents APK variants like the targets in iOS...

EDIT 1:
For the variant and the flavor, I found exactly the video I needed: Video variant & flavor

For the icon for each variant : Video icon change by variants

For the preprocessoring, I tried to install Manifold but impossible to understand how to install it...

EDIT 2:
I found that way to use the preprocessor, but it seems not to work...