How to track the target as an external url?

Question

Google Analytics

Hello. All forms on my site lead to whatsapp. That is, the url of the targets is external. In metrics and GA, you can only set the internal page. How can you track goals if the goal is external?
At first I wanted to use GTM, through an event and a CSS selector for buttons. But there are too many buttons. Approximately
10 buttons on each of 6 pages. I really do not want to create a trigger for each. They must have something in common.
I'm trying to create a click-only links trigger in GTM with a URL. Well, of course, with reference to the tag and goal in the metric and GA. But this only seems to work for internal urls.
I broke my whole head, help someone who came across. Is there really no simple solution for such a simple problem?

Answer 1

Through an event and a CSS selector for the buttons. But there are too many buttons. They must have something in common.

Use a generic class for the buttons you want