JSFiddle - React, Tailwind, and code Playground
HTML
<a class="link_class" href="somelink.com">Link</a>
JavaScript
$('.link_class').attr('onclick', "return gtag_report_conversion('somelink.com');")
<a class="link_class" href="somelink.com">Link</a>
$('.link_class').attr('onclick', "return gtag_report_conversion('somelink.com');")