IPv6 port forwarding and port existing iptables rules to firewalld service

We currently enforce the firewall configuration using iptables and ip6tables. The iptables rules are being stored in a file and effected using iptables-restore and ip6tables-restore command. I have 2 questions on this:
1) Using ip6tables, is there a way to redirect the IPv6 TCP traffic arriving at a specific port to another port within same interface?
2) As an alternative, we are also exploring the firewalld service to do this. The firewalld service seems to be persisting the rules in XML files. Is there any easy way to translate the existing iptables and ip6tables rules to these firewalld understandable XML file format?