defining subprojects in a deeply nested directory tree

how do I define sub projects in a nested directory tree where the sub-project folders are not immediate children of the root project

root
  lala
    A
  lulu
    B

Now I Want to add A & B as sub projects. If I do

//settings.gradle
include "lala:A", "lulu:B"

then also "lala" and "lulu" will be added as sub projects. However I only want to add A & B and nothing else.