In addition to DNS connection, is it possible to see how much connection is made with direct IP addresses?
Not with Pi-hole. If a client has an IP, it has no need to resolve a domain name to the IP, and no request will be sent to Pi-hole. Pi-hole can only show the queries it receives, and they will all be for domain names.
You need a firewall to block or count at the IP level.
Unfortunately. Thanks for the quick response. Have a nice new year.