Thank you for reaching out. Unfortunately, this is something which is not supported currently. I will let the team know that you're interested in this feature and will make sure to forward the feedback.
Please let me know if you need more assistance on this. I'd be happy to help.
In that case, can you confirm whether it would violate any licensing agreements or TOS to implement this library on our site? GitHub - morris/typekit-cache: Keeps a site's Typekit in localStorage and injects it on page load, e...