Contributing to CMake
As you already know, CMake is open source software developed by Kitware. Kitware maintains development activity for CMake in a dedicated GitLab instance at https://gitlab.kitware.com/cmake. Having everything available as open source and transparent means that getting involved in CMake is pretty easy. You can view the issues, merge requests, and get involved in the development of CMake. If you believe you have discovered a bug in CMake or want to make a feature request, you can create a new issue at https://gitlab.kitware.com/cmake/cmake/-/issues. If you have an idea about improving CMake, discuss that idea by creating an issue first. You can also take a look at open merge requests at https://gitlab.kitware.com/cmake/cmake/-/merge_requests to assist in reviewing the code being developed.
Contributing to open source software is crucial for the sustainability of the open source world. Please don't hesitate to help the open source community in whatever ways...