CMAKE_SYSTEM_APPBUNDLE_PATH
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Cmake/docs/3.21/variable/cmake system appbundle path
CMAKE_SYSTEM_APPBUNDLE_PATH
New in version 3.4.
Search path for macOS application bundles used by the find_program(), and find_package() commands. By default it contains the standard directories for the current system. It is not intended to be modified by the project, use CMAKE_APPBUNDLE_PATH for this.
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https://cmake.org/cmake/help/v3.21/variable/CMAKE_SYSTEM_APPBUNDLE_PATH.html