Useing gh-ost to alter instance in a MGR group

there is no slave status on a secondary instance in a Mgr group ,so that gh-ost can't judge other instance delay，to handlle throttle .
instead of slave status . could gh-ost useing performance_schema.replication_group_member_stats(COUNT_TRANSACTIONS_IN_QUEUE)
to judge if need to decrease the throught of current migrating .