Know the password format, how to configure the rules?

[Snoopy]

depending on how big the first comb1.txt is, you can skip the second processing with combinator and leave it straight to hasccat to combine the list with itself

https://hashcat.net/wiki/doku.php?id=combinator_attack
just specify the comb1.txt twice

hashcat -m 0 -a 1 hash.txt comb1.txt comb1.txt