The ability to partially rollback transactions to a specified point.

Is there any plan to implement distributed transaction that involves more than one data stores (for e.g. an RDBMS and Mongo)? We have one such requirement and tried a simple POC by creating a simple class extending XAResource (MongoXAResource implements XAResource) and overriding below methods.

@Override
public void commit(Xid xid, boolean b) throws XAException {
clientSession.commitTransaction();
}

@Override
public void rollback(Xid xid) throws XAException {
clientSession.abortTransaction();
}

It appears to work but i think there is a lot more to do. Is there any plan to implement by MongoDB team?