iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4
nft add rule ip nat postrouting oifname eth0 counter snat to 1.2.3.4

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4-1.2.3.6
nft add rule ip nat postrouting oifname eth0 counter snat to 1.2.3.4-1.2.3.6

iptables-translate -t nat -A postrouting -p tcp -o eth0 -j SNAT --to 1.2.3.4:1-1023
nft add rule ip nat postrouting oifname eth0 ip protocol tcp counter snat to 1.2.3.4:1-1023

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random
nft add rule ip nat postrouting oifname eth0 counter snat to 1.2.3.4 random

iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random --persistent
nft add rule ip nat postrouting oifname eth0 counter snat to 1.2.3.4 random,persistent