Get the Ext JS specific customization from the activity.

        :return: The Ext JS specific customization in `list(dict)` form

def widgets(self):
        """
        Get the Ext JS specific customization from the activity.

        :return: The Ext JS specific customization in `list(dict)` form
        """
        customization = self.activity._json_data.get('customization')

        if customization and "ext" in customization.keys():
            return customization['ext']['widgets']
        else:
            return []