In one window start a JetStream enabled nats server:
docker run --network host -p 4222:4222 nats -js
You'll want to do this outside of docker to keep the credentials that are generated.
nsc add user -a YourAccount --name leafnode --expiry 1M
You'll get a credential file somewhere like
~/.nkeys/creds/synadia/YourAccount/leafnode.creds, mount this file into the docker container for JetStream using
docker run -ti -v ~/.nkeys/creds/synadia/YourAccount/leafnode.creds:/leafnode.creds --name jetstream nats:latest
 2021/10/08 21:48:51.426008 [INF] Starting nats-server
 2021/10/08 21:48:51.426091 [INF] Version: 2.6.1
 2021/10/08 21:48:51.849033 [INF] Connected leafnode to "connect.ngs.global"