Sorry, I'm not familiar with this tech so looked up Jetstream and it seems to be archived https://github.com/nats-io/jetstream. Not sure that would be a good endorsement to try to use something that is no longer maintained or am I looking at the wrong one?
JetStream was originally designed/built separately, but is now built into NATS. So that repo is obsolete. NATS with JetStream is here: https://github.com/nats-io/nats-server.