Class OverflowMenu

Holds a list of OverflowMenuItem objects that are displayed in a pop-up menu.

Only available for Google Chat apps. Not available for Google Workspace Add-ons.

const overflowMenuItem = CardService.newOverflowMenuItem();
// Finish building the overflow menu item...

const overflowMenu =
    CardService.newOverflowMenu().addMenuItem(overflowMenuItem);