Can an option to turn off this notification be added?

Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

That error already tells you how to stop that spam You need to explicitly disable SSL by setting useSSL=false. The area to add that is under the data heading. Additional guidance can be found here: https://github.com/lucko/LuckPerms/wiki/Storage-system-errors#mysql-ssl-errors

Thanks very much RJHaytree

I cannot find that option.

Maybe it has been removed on this version. Version = 4.3.62

Try reading the section again. It clearly says to add something.