Template form with Mixture.io and JSON?

Hi, I'm building my website with Mixture.io - a static site generator that runs on Shopify's Liquid engine for templating. 

We want to template landing pages with it and so far have been successful with things like a headline, lead image, body copy, etc as variable but we're having difficulty in templating Marketo forms.

We have our own styled form and can generate the raw HTML forms on Marketo but we can't figure out how to turn Marketo's specifications into a parameter/variable to be usable in our JSON file.

Any ideas on how we can accomplish this so that our landing pages can be templated? 

Thanks!