Are there any known ways to use ConTeXtLMTX with Neovim? 

I read the wiki page for Vim and it describes a hack to get latex-suite to work with ConTeXt. [1] It wouldn't be too much work to submit a pull-request to VimTeX (despite the name, this is for Neovim) [2] to add ConTeXt support, but I don't want to duplicate work if someone else has already done it.

Clint

[1]: https://wiki.contextgarden.net/index.php?title=Vim&mobileaction=toggle_view_desktop, bottom of page

[2]: https://github.com/lervag/vimtex