Configure / Download the CMake's Qt Help documentation

CMake offers on their documentation website https://cmake.org/documentation Qt Help documentation starting with version 3.1.

One can download the CMake.qch file like https://cmake.org/cmake/help/$VERSION/CMake.qch where $VERSION could be v3.1 - v3.12 or latest.

This documentation is not part of the official CMake binaries, I have opened a feature request to include it: https://gitlab.kitware.com/cmake/cmake/issues/18465

I would like to suggest to have in Qt Creator in the CMake configuration page, a way to either download the according Qt Help documentation file and / or have a way to detect if the file is present on the system and configure it in Qt Creator's help system.

This way one could press F1 and would have access to CMake's documentation.