I was going on information from Red Hat that RHEL7 can't do that. Turns out, Red Hat was right, RHEL7 can't.
systemd-journald-remote was added with systemd 212, RHEL and CentOS ship with 208, so no, journald on RHEL7/CentOS7 can not do remote logging.
I also like completely ignoring how journald breaks every log analysis tool.