I'm looking for a way to add custom scripts to the context menus (right click with the mouse) of the paragraph style and the character style palette.

So the user finds the style he's looking for, right clicks on it, chooses my script, the script gets the reference to the selected style item, and runs with it.

I asked this in the forum (in 2015), and it’s still not possible but hardly missed:
https://community.adobe.com/t5/indesign-discussions/id8-js-context-menu-item-for-paragraph-and-character-style-palette/td-p/7416881

Thanks, Tobias