When a soup is too hot to eat, we wait for it to cool off, then we can say that the soup is nibbāna enough to eat.
When a burning charcoal gradually cools down until it’s no longer hot it is said to nibbāna.
When a fierce animal is tamed and trained until domesticated it can be said to nibbāna.
In pali texts, the same word is used for things, animals, and people.
When something is cool rather than hot it is nibbāna in one sense or another.
So be cool.