How to add gitbook page to Google Analytics

Just after i created this blog i realized that it would be great to see the analytics of it. Right after that i installed the GA extension and i just had to provide the tracking id. Easy right? Well..

This type of problems is what i think should be called a brain headache - find something somewhere there... It seems that the info about setting this thing up is not valid since GA4 and therefore the process has been changed