This isn’t really an ACF question. ACF will not automatically add something like this to a link unless you alter the theme files to do it.
You would need to write a script that would read though all of the links and add the events. https://stackoverflow.com/questions/33809527/adding-onclick-to-all-tel-links
We use google tag manager rather than GA. https://tagmanager.google.com/. Most good themes include a way to add the code needed for tag manager. Using tag manager anyone can then install GA and add events to elements on a page as well as add other scripts to the site without needing to modify the theme to do it.
