Does somebody has a CMakePresets.json example?

Hi,
I’m using Visual Studio Code with CMake files. Currently it works by selecting so called ‘kits’. But I want more control and therefore want to switch to using a CMakePresets.json file to select the compiler etc.
But it is a pain to figure out what should be in this file.
Maybe someone also works with this file and can share this info? So that I have a starting point.