From GameWatcher: “The team behind WolvenKit an open-source modding project that provides modding tools for The Witcher 3 has announced that it is working on extending support to also include Cyberpunk 2077.
WolvenKit would, thus, enable Cyberpunk 2077 modding support, feature that will otherwise be missing when the RPG launches.”
Source: N4G PC Witcher 3 Open-Source Modding Project WolvenKit Will Support Cyberpunk 2077