Export user from a cluster to another cluster (including password and roles)

Hi everyone,
I am learning about how to upgrade Couchbase 6.0 up to Couchbase 7.0
I use XDCR to replicate all buckets to standby cluster very well.
But I am confused about how to export user (and password as well) from current cluster to standby cluster?
In Oracle, we can use impdp/expdp to do it,
In Couchbase, is there any way to do it ?
Can you suggest me one ?