Loading font hosted on Marketo blocked by CORS

We’re implementing Knak as a pagebuilder for Marketo. The final pages will be synced and hosted on Marketo, but they are built on Knak. Knak allows you to load fonts via a CSS file with @font-face, but when trying to load those fonts we get a CORS error because it’s Knak’s domain trying to load the fonts.

Is there any way to change CORS policy on Marketo to allow certain domains to load fonts? The pages will ultimately be hosted on our Marketo domain so it shouldn’t be an issue then, but we need to get them to show in the pagebuilder in the meantime.