Yes, it is possible to change it. In order to do so, you would need to edit the service file (consul.service) and update the "User" property to root:
[email protected] ~# vi /etc/systemd/system/consul.service
ExecStart=/opt/IMDataAggregator/consul/bin/consul agent -bind=xxxxxx -disable-host-node-id -config-dir=/opt/IMDataAggregator/consul/conf
ExecReload=/bin/kill -HUP $MAINPID
Then chown the files owned by consul to be owned by root.
Note: upgrades will set it back to consul