We already have GTK-specific presets in `CMakePresets.json`. They work pretty well both with `cmake` command line tool and "Visual Studio Code" with "CMake Tools" extension.
Pull request: https://github.com/WebKit/WebKit/pull/20921
Committed 271137@main (5ad0c5b53b01): <https://commits.webkit.org/271137@main> Reviewed commits have been landed. Closing PR #20921 and removing active labels.