How to get current url in handlebars

Question

i have a function getQuantityValueFromURL in helpers

getQuantityValueFromURL: (url) => {
    const currentURL = new URL(url);
    const urlParams = new URLSearchParams(currentURL.search);
    return urlParams.get('quantity');
}

how can i pass the current url of the site when calling this function

{{getQuantityValueFromURL current url}}

i tried using window.location.href for the url but it didn't work