Can Hashcat be used to do a dictionary attack with a filter?

As part of a school assignment I’m trying to crack a password with rockyou.txt. Since it would take 4 hours I’m trying to limit the amount of words it checks with a filter. I know that the password is only made of digits and has at most 7 characters. I tried to do something with attack mode 6 but it seems like the filtering options only add stuff to already existing passwords? Either way I’m having trouble finding some option that does exactly what I want.

submitted by /u/Swaggy-G
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