You will have a hard time achieving that with third-party services
because in most cases, whether the visit will be registered or not depends on javascript code or some form of call to, for example, a 1x1 pixel image from their servers, and most modern browsers block these things to protect privacy…
So that even if you get a result, that figure only represents the number of visitors who allowed themselves to be seen (on your page)
it is most ideal and accurate to have the log directly on the server
but here on the free service, such a thing could put an additional load on your website (because writing logs consumes CPU and RAM) or it could even trigger a suspension because, for example, DDoS or a bunch of bots start digging on your site, which is already a problem in itself, and especially in addition, when your script works at full speed with every REQs they request
if you can use Cloudflare, then you can use this plugin (or read below on the topic how to do it without this plugin)