From the following issue at CrateDB GitHub page it seems it is not possible, i.e., the Kafka protocol is not supported by CrateDB. https://github.com/crate/crate/issues/7459
Is there another way to load data from Kafka into CrateDB?
Usually you'd use Kafka Connect for integrating Kafka to target (and source) systems, using the appropriate connector for the destination technology.
I can't find a Kafka Connect connector for CrateDB, but there is a JDBC sink connector for Kafka Connect, and a JDBC driver for CrateDB, so this may be worth a try.
You can read more about Kafka Connect here, and see it in action in this blog series:
Disclaimer: I work for Confluent, and I wrote the above blog posts.