$ cat /etc/pf.anchors/remiii.forwarding
rdr pass on lo0 inet proto tcp from any to 127.0.0.1 port 80 -> 127.0.0.1 port 10080
rdr pass on lo0 inet proto tcp from any to 127.0.0.1 port 443 -> 127.0.0.1 port 10443
$ sudo pfctl -ef /etc/pf.anchors/remiii.forwarding