option to have recaptcha js marked as defer/async

ContactForm7 including reCaptcha really impacts page load speed on mobile, as the js is huge.
Could we have a defer or async option ? This solves most of the performance issue in page speed / lighthouse, with no impact on captcha feature AFAICT.

Currently solving it with this little hack un functions.js, but having a checkbox (or maybe even having it deferred by default?) would be nice

// mark recaptcha js deferred
function defer_js( $url ) {
        if ( is_user_logged_in() ) return $url;
        if ( strpos( $url, 'recaptcha/api.js' ) ) {
                return str_replace( ' src', ' defer src', $url );
        }
        return $url;

}
add_filter( 'script_loader_tag', 'defer_js', 11 );