I have not seen it, and I don't think it aligns to the conventional 'meaning' of right-click.
Normally, the left-click performs a primary action and the right-click opens a dialog offering multiple actions - including the primary one. So, when a user right-clicks on a link in a browser, they have the option to not just open the link (the left-button action), but to open in a new window, save as a favourite, email to a friend and so on.
The other problem is that it makes options non-discoverable. I want to subtract an item, but everything says 'Add'! Users rarely right-click on buttons either on desktop or the web, so discovery will be poor unless users read how to remove items before operating the application.
As an alternative, you could look at checkboxes and toggle buttons (common on mobile). You could also look at simply providing two buttons or being able to switch the interface into a 'delete' mode.