Create new style based on existing style in another file

Hi Figma,

I have an idea, this idea is born after I saw the tokens plugin is so powerful but it is eat my memory a lot. So how about figma create this is possible to have as native feature, create a semantics style library based on foundation style library. this feature, at least for me, will be nice collaboration for swap library feature.

maybe it could a awesome to have if there is any possibility to export json/push to cloud with customize format :))

p.s. sorry for my bad english