How can I set a custom secondary font as standard?

Hi,
I am about to launch my own shopify store in October and getting close to finished.

Through my own digital agency, I have created own fonts for my brand. The primary font I have been able to code in as “standard”. I have however problems making the secondary font become “standard” as the secondary one.

Any suggestions on how to this?

In advance, thanks.

Kind regards,
Kristian