AUTOGEN_TARGETS_FOLDER
From Get docs
Cmake/docs/3.21/prop gbl/autogen targets folder
AUTOGEN_TARGETS_FOLDER
Name of FOLDER for *_autogen
targets that are added automatically by CMake for targets for which AUTOMOC is enabled.
If not set, CMake uses the FOLDER property of the parent target as a default value for this property. See also the documentation for the FOLDER target property and the AUTOMOC target property.
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https://cmake.org/cmake/help/v3.21/prop_gbl/AUTOGEN_TARGETS_FOLDER.html