The installer patching for the CMake host path for Android was setting a wrong path for the host in qt.toolchain.cmake file. It is setting the value (according to my installation)

set(__qt_initial_qt_host_path "/home/assam/Qt")

that's the Qt install path, in fact, it should be 

set(__qt_initial_qt_host_path "/home/assam/Qt/6.0.0/gcc_64")

There is another instance in the same file

set(__qt_initial_qt_host_path_cmake_dir "/home/assam/Qt/lib/cmake")

Where it should be corrected to 

set(__qt_initial_qt_host_path_cmake_dir "/home/assam/Qt/6.0.0/gcc_64/lib/cmake")

So the main thing here is that the path should contain the Android version's host path, not the Qt root path.