file.js

if (!window.standard.nazov || !window.standard.kategoria) {
   return;
}

gtag("ab", "bc", {
  window.standard.nazov, window.standard.autor, window.standard.kategoria
})

if (window.location.host.contains("?ad")) {
   gtag("reklama", "neplatena", {
    zascrollovany: document.documentElement.scrollTop
   })
}

single.php

<? 

header
body 
  
<script>

  window.standard = {
     nazov: <? echo nazov ?>,
     autor: <? echo nazov ?>,
     kategoria: <? echo nazov ?>
  }
  
</script>

clanok

<script src="/moj/js/file.js"></script>