Add content to share contextmenu

Im currently developing an app for renaming the tokens for shared files (
To achieve that, Im trying to add my change form to the menu that appears when you click on the three dots at a shared link item.
What I found in the docs is this, which works, but does not show me other options of menus (as I need it for my app), so I tried to take some menus i could find in the JS files of the files app. That did not work.
The npm link given in the docs does’nt help too :confused:
Anyone having better ways to do that or maybe a working “name” for the menu?