Add intercom widget

Hi,
I’m new to Nextcloud and struggling to add the intercom widget.

Basically I need to add this script on each rendered page:

<script>
  window.intercomSettings = {
    app_id: "xxxx"
  };
</script>
<script>(function(){var w=window;var ic=w.Intercom;if(typeof ic==="function"){ic('reattach_activator');ic('update',intercomSettings);}else{var d=document;var i=function(){i.c(arguments)};i.q=[];i.c=function(args){i.q.push(args)};w.Intercom=i;function l(){var s=d.createElement('script');s.type='text/javascript';s.async=true;s.src='https://widget.intercom.io/widget/n30dy03z';var x=d.getElementsByTagName('script')[0];x.parentNode.insertBefore(s,x);}if(w.attachEvent){w.attachEvent('onload',l);}else{w.addEventListener('load',l,false);}}})()</script>

I’ve tried to add it using a theme but I have a unsafe-eval / nonce issue.

What would be the recommended way to proceed?

Thank you all in advance!