nautilus-copy-path VS cover-thumbnailer

There are extensions, like nautilus-copy-path which can implement it.

A feature like that doesn't really need to be intuitive. Average, non-techi user will never need that, and experienced user can easily look it up (took me less that a minute to find). If you want something integrated to your right click menu, you can install this nautilus extension. It even comes with keyboard shortcuts like Ctrl+Shift+C to copy path

There is an extension for that: https://github.com/chr314/nautilus-copy-path

You can check the examples folder in the gitlab repo for some very basic demonstration of what can be done with Nautilus-python, or this repo: Nautilus Copy Path/Name for a more advanced example with the right-click menu.

I dont know if there is a default plugin but I also found this: https://github.com/flozz/cover-thumbnailer

Two of the thumbnailers that can create thumbnails for folders are gnome-directory-thumbnailer and cover-thumbnailer. Cover-thumbnailer includes a a tool that can be used to make folder thumbnails manually.