pri files functions on SUBDIRS - beyond export

[genner]

I am creating a function in a .pri file that will be included in a .pro file with the intent of being able to do:

template(subdirs)
addMyProject(libA)
addMyProject(libB)
addMyProject(libC)

instead of

template(subdirs)
SUBDIRS += libA
libA.path = source/
SUBDIRS += libB
libB.path = source/
SUBDIRS += libC
libC.path = source/

Same problem if I want to use the depend keyword.

My current implementation is the following one:

defineTest(addMyProject) {

  library_name = $$1

  SUBDIRS += $$library_name
  export(SUBDIRS)

  {$$library_name}.file = {$$library_name}/source/{$$library_name}.pro
  QMAKE_EXTRA_TARGETS += {$$library_name}
  export(QMAKE_EXTRA_TARGETS)
}

The SUBDIRS part is ok. I have tried to make it work for the .file part in different ways, but still I have not found a solution.

Each library contains different sub-projects, and the goal is to let Qt creator see only one of them (the one at the path source/libraryname.pro).

The issue is that all the libraries are correctly displayed, but also all the other sub-projects. Basically, only the SUBDIRS variable is recognised, not the .file keyword

Any hints?