blog.grink.tech/custom-theme/templates/include/gtag.html

<script async src="https://www.googletagmanager.com/gtag/js?id={{ GOOGLE_SITE_TAG }}"></script>
<script>
	window.dataLayer = window.dataLayer || [];
	function gtag() { dataLayer.push(arguments); }
	gtag('js', new Date());
	gtag('config', '{{ GOOGLE_SITE_TAG }}');
</script>