most third party clients don't feature the zookeeper and consumer group
logic of the official scala/java clients due to the complexity of it.
There are plans to move much of the consumer group logic from the client
side to the broker to alleviate this, making it easier for third party
clients to be feature comparable to the official one, but I don't know the
time frame of that.
If you need support for a certain API in one of the third party clients the
best way is usually to submit a project bug report (usually github issue)
and a use case.