В мене о так <link rel="alternate" hreflang="x-default" href="https://site.com/xxxx.html"> <link rel="alternate" hreflang="uk" href="https://site.com/xxxx.html"> <link

rel="alternate" hreflang="ru" href="https://site.com/ru/xxxx.html">

через сніпет Canonical (хз де його брав)

<?php
$id = $modx->documentIdentifier;

$furl = 'https://site.com';

$out = '
<link rel="alternate" hreflang="x-default" href="'.$furl.'[(_ua_url)]">
<link rel="alternate" hreflang="uk" href="'.$furl.'[(_ua_url)]">
<link rel="alternate" hreflang="ru" href="'.$furl.'[(_ru_url)]">
';
if (isset($_GET['page'])){
$pg = modx_sanitize_gpc($_GET['page']);
$url = $modx->makeUrl($id,'','','full');
return $out.'<link rel="canonical" href="' . $url . '?page='.$pg.'">';
} else {
return $out.'[!if? &is=[(_lang)]:=:ua &then=`` &else=<link rel="canonical" href="[(_ua_url)]">!]';
}

Дякую