I have cookie consent in GTM and every built-in tag work well (Analytics, etc). I know that I can make condition for "Custom HTML" via "Require additional consent for tag to fire" but I need add custom HTML as:

<script type="text/javascript">
var xyzSymbol = {{Symbol of order}};
var xyzPrice = {{Total price of order}};
var hasAdStorageConsent = ?????  // true or false if has user "ad_storage"
</script>
<script type="text/javascript" src="//www.xyz.cz/rs/static/rc.js"></script>

Does exists a variable with current ad_storage state? Or has a callback for it? or something etc.

Thank you for any help.