[keycloak-user] Custom GET parameters in the registration page

Is it possible to have custom GET parameters in the url of the registration page? I wrote a JavaScript to auto fill a field in the registration page that gets its value from the GET url. My issue is that when I add a custom parameter to the url Keycloak redirects the registration page to the same page without my custom parameter, as a result I cannot autofill the form field from the url.