Adding javascript to a single page

Hi guys, how to add javascript to a single page of my website?

Here is the script

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<!– BEGIN JIVOSITE CODE {literal} –>
<script type=’text/javascript’>
(function(){ var widget_id = ‘XXXXXXXXX’;
var s = document.createElement(‘script’); s.type = ‘text/javascript’; s.async = true; s.src = ‘//code.jivosite.com/script/widget/’+widget_id; var ss = document.getElementsByTagName(‘script’)[0]; ss.parentNode.insertBefore(s, ss);})();</script>
<!– {/literal} END JIVOSITE CODE –>

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Here is page – https://www.coma.lv/wordpress-website-development/