Optional Keyboard Shortcuts existing Chrome Extension

I have a Chrome Extension called "Quick Search". It is context menu search tool. I would like to give the user the opportunity to define a keyboard shortcut for the individual items in his context menu list.

https://chrome.google.com/webstore/detail/quick-search/lbdmjkfkdgnlooohfckebfngbebjlbai

The code is available on GitHub:
https://github.com/khohh/crx-context-menu-search