I'm pretty sure Sublime has a plugin that uses an actual NeoVim instance to process all inputs with all your configuration. Never tried it, I don't use Sublime. But I can confirm the feature works well in Firefox via FireNvim.
I think this is what vscode does as well. The magic is in how it cooperates with the GUI. All jumps and movements work, as well as search/replace and the hilighting and selections are even the native vscode hilights and selections so it's fluid going from mouse to vim and back. Last time I used Sublime (4+ years ago) there were a bunch of vim commands that didn't work.
