Documentation for recommended kafka plugin

Hello,
is there any documentation on the recommended org.galaxio:gatling-kafka-plugin_2.13?
I would like to know which injection methods are available and how each of the available options works.
For example:
{
setUp(
kafkaProducer.injectOpen(incrementUsersPerSec(1)
.times(5).eachLevelLasting(1)
.separatedByRampsLasting(10)
.startingFrom(1.0))
).protocols(kafkaProtocol);
}

Thanks in advance