Track ShoutOut clicks using custom events

Hi,

I’m using several leads campaigns from google and outbrain with a goal to get new users to click on the “subscribe” button on a ShoutOut widget and provide their email.
I’ve been trying to use custom events for tracking, and while it’s clear how to do it with a button, none of the custom events on the ShoutOut widget seems to be relevant as all 4 of them are focused on the widget itself and not on the actual click.

Any suggestions on a work around here?

Thanks!