Is there a way to store and access shared assets between HTML overlays in a Folio?

I'm using numerous HTML graphics throughout a folio, each one requiring common script and font files. Rather than store these assets in each graphic set within a folio's HTML overlay, is it possible to store them in a root folder in the folio that is then accessible to any HTML overlays used throughout it? And if it possible, how would I access them?

This would save a great deal on overall folio size. Though I suspect it's not possible, I'd find it a useful feature if it were somehow possible to implement it in the future.

Thanks,

Brice.