Gatsu i do not know if it works, but you can try....
in extend.php add
use Flarum\Frontend\Document;
and in frontend:
$document->head[] = '<script type="text/javascript" async="true">(function(){var host='www.themoneytizer.com'; var element=document.createElement('script'); var firstScript=document.getElementsByTagName('script')[0]; var url='https://quantcast.mgr.consensu.org' .concat('/choice/', '6Fv0cGNfc_bw8', '/', host, '/choice.js'); var uspTries=0; var uspTriesLimit=3; element.async=true; element.type='text/javascript'; element.src=url; firstScript.parentNode.insertBefore(element, firstScript); function makeStub(){var TCF_LOCATOR_NAME='__tcfapiLocator'; var queue=[]; var win=window; var cmpFrame; function addFrame(){var doc=win.document; var otherCMP=!!(win.frames[TCF_LOCATOR_NAME]); if (!otherCMP){if (doc.body){var iframe=doc.createElement('iframe'); iframe.style.cssText='display:none'; iframe.name=TCF_LOCATOR_NAME; doc.body.appendChild(iframe);}else{setTimeout(addFrame, 5);}}return !otherCMP;}function tcfAPIHandler(){var gdprApplies; var args=arguments; if (!args.length){return queue;}else if (args[0]==='setGdprApplies'){if ( args.length > 3 && args[2]===2 && typeof args[3]==='boolean' ){gdprApplies=args[3]; if (typeof args[2]==='function'){args[2]('set', true);}}}else if (args[0]==='ping'){var retr={gdprApplies: gdprApplies, cmpLoaded: false, cmpStatus: 'stub'}; if (typeof args[2]==='function'){args[2](retr);}}else{queue.push(args);}}function postMessageEventHandler(event){var msgIsString=typeof event.data==='string'; var json={}; try{if (msgIsString){json=JSON.parse(event.data);}else{json=event.data;}}catch (ignore){}var payload=json.__tcfapiCall; if (payload){window.__tcfapi( payload.command, payload.version, function(retValue, success){var returnMsg={__tcfapiReturn:{returnValue: retValue, success: success, callId: payload.callId}}; if (msgIsString){returnMsg=JSON.stringify(returnMsg);}event.source.postMessage(returnMsg, '*');}, payload.parameter );}}while (win){try{if (win.frames[TCF_LOCATOR_NAME]){cmpFrame=win; break;}}catch (ignore){}if (win===window.top){break;}win=win.parent;}if (!cmpFrame){addFrame(); win.__tcfapi=tcfAPIHandler; win.addEventListener('message', postMessageEventHandler, false);}}; if (typeof module !=='undefined'){module.exports=makeStub;}else{makeStub();}var uspStubFunction=function(){var arg=arguments; if (typeof window.__uspapi !==uspStubFunction){setTimeout(function(){if (typeof window.__uspapi !=='undefined'){window.__uspapi.apply(window.__uspapi, arg);}}, 500);}}; var checkIfUspIsReady=function(){uspTries++; if (window.__uspapi===uspStubFunction && uspTries < uspTriesLimit){console.warn('USP is not accessible');}else{clearInterval(uspInterval);}}; if (typeof window.__uspapi==='undefined'){window.__uspapi=uspStubFunction; var uspInterval=setInterval(checkIfUspIsReady, 6000);}})();</script>'
example:
https://github.com/justoverclockl/og-meta-tag/blob/main/extend.php#L28