usr_lib_firewalld_services_ovn-central-firewall-service.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>ovn-central-firewall-service</short>
  <description>Firewall service for ovn central</description>
  <port protocol="tcp" port="6641"/>
  <port protocol="tcp" port="6642"/>
</service>