vim has support for QML as of 2023-08-20 and neovim as of 2023-08-21.
I strongly suggest using the upstream support if at all possible.
I will leave this repository up for people who cannot use the support from upstream, but I will archive it sometime during 2024.
I take absolutely no credit for this - all I did was write the ftdetect line and package it.
The actual syntax highlight file was done by Warwick Allison and subsequent work by the contributors without whom this would not be possible.
Use one of the excellent bundle managers or add it as a submodule under your bundle directory.
Enjoy, Peter Hoeg