Disabling authentication on specific routes of a Microservice

Hi, I am new to kong so please forgive me if some of the things do not make sense.

So here is the situation. I have a Microservice X that has 5 routes. Out of those 5 routes, 3 routes need authentication and 2 can be used without authentication.

What is the best practice to have such a configuration? Do I manually add those 5 routes and then manually add Authentication Plugin on the 3 routes that needs Authentication?

I think use case like this post Protect one Route of Service