$ openstack host list | grep -i jkt | awk '{print $2}'
jkt01z03nova001
jkt01z01nova001
jkt01z01nova002
jkt01z03nova003
jkt01z02nova001
jkt01z02nova002
jkt01z01nova003
jkt01z01nova004
jkt01z03nova002

Using for looping while take a long time, so better list manually.

openstack server list --all --host jkt01z03nova001 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z01nova001 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z01nova002 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z03nova003 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z02nova001 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z02nova002 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z01nova003 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z01nova004 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u
openstack server list --all --host jkt01z03nova002 -f value -c ID | xargs -I{} openstack server show {} -f value -c user_id | xargs -I% openstack user show % -f value -c email | sort -u

Arrange in excel/text.