{
:local lists {"Port-Scanners"}
:local export "port-scanners"
:local file "/ip firewall address-listn"
:foreach i in=$lists do={
:set $file ($file . "remove [find list="" . $i . ""]n")
:foreach j in=[/ip firewall address-list print as-value where list=$i] do={
:set $file ($file . "add list="" . ($j->"list") . "" address="" . ($j->"address") . ""n")
 }
}
:if ([/file print count-only where name=$export] = 0) do={
/file print file=$export
:delay 2
/file set $export contents=$file
 }
}

файл сразу готов для импорта командой

/import port-scanners.txt