i'm trying to mimic the Rabbitmq's password hash generation algorithm in my helm chart: How to generate password_hash for RabbitMQ Management HTTP API

I need to work with bytes, instead of strings, so obviously the following template did not work:

{{ printf "%s%s" "salt" ("saltpass" | sha256sum) | b64enc }}

Is there any way to add my custom go code?

Also, if not, is there any option to work with bytes there? (convert string to UTF-8 bytes, then use the sha256sum and the b64enc on bytes? or they have only string implementation?)

Thanks