firewall - How can I add iptables rules that persist across reboots?

I want to add an iptables rule on my Android phone. I used:

iptables -t nat -A PREROUTING -p 6 -d 192.168.66.1 --dport 80 -j DNAT --to 192.168.66.1:808

...as root. This rule can be checked in adb shell, and I can see that it was added:

# iptables -t nat -nL
chain PREROUTING (policy ACCEPT)
prot   opt    source       destination    idletimer_nat_PREROUTING  

all    --     0.0.0.0/0    0.0.0.0/0      DNAT       
tcp    --     0.0.0.0/0    192.168.66.1   tcp dpt:80 to:192.168.66.1:8080

I want this rule to persist after a reboot, so I added an iptabless file in /etc/sysconfig with these contents:

-t nat -A PREROUTING -p 6 -d 192.168.66.1 --dport 80 -j DNAT --to 192.168.66.1:8080

However, when I reboot my phone, no rule is added.

Does Android support the /etc/sysconfig/iptables path? I got this path from a PC Linux installation ( I tested /etc/iptables/rules.v4 as well, it also did not work).

At the same time, I also don't know whether its content is right.

Additionally, I cannot root my testing phone in the future. Is it possible to add persistent iptables rules on an unrooted phone?