Custom font styling on forms

I'd like to customize the font styling on our forms, since right now our brand font isn't one of the options available on HubSpot. I know we can do this for forms on HubSpot pages, but at this time there's no way to do this for forms embedded on non-HubSpot pages. When we were using Zoho, I believe we were able to customize the font within the embed code itself, but that doesn't seem to be an option here.

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