mbed-os/tools/test/config/app_override_libs/test_data.json

{
   "test_target": {
        "lib1.p1": "v_p1_lib1_app",
        "lib1.p2": "v_p2_lib1",
        "lib1.p3": "v_p3_lib1",
        "lib2.p1": "v_p1_lib2_app",
        "lib2.p2": "v_p2_lib2"
    }
}