Mask generator not working?

[Innsane]

Did you ever find a way to increase the password input length?

I have a sha256 hash that has been created by hashing a word eg"password" then hashing the resulting string again and again.

Eg Password > hash 1
Hash1 > hash2
Hash2 > hash3
Hash3 > hash4
Hash4 > hash5

So for example I know hash5 and hash4 but how do I get hashcat to recognise hash5 = sha256(hash4) ?
I can't find a way of using hash4 as an input.

Would it be possible to use the first 55 characters of hash4 and use a rule/mask to tell hashcat to add 9 hexadecimal characters to it?