Additionally, Superhuman seems to be doubling down on this approach for their productivity inbox and VS Code has this type of input/UI available with Cmd-P. Spacemacs kind of does this when helping you navigate emacs modes.

It's a fantastic marriage of traditional search box feature discovery and keyboard shortcuts.

These are the places where we got our inspiration from :) But we couldn't find any relevant attempts to implement something like this in a browser, especially for non-technical users.