Now you finally autofocus Leica M-mount lenses on Nikon Z mirrorless cameras with the upcoming Techart TZM-01 lens adapter. Here are two video demos of the new adapter in action:
https://twitter.com/ShotenKobo/status/1317095172610478082
A similar adapter has been available for Sony E-mount cameras for years:
View this post on Instagram
Techart lens adapter in action: focusing Leica M lenses on Sony a7 (sorry for the shaky video)
Source: Shotenkobo, via LeicaRumors