We currently handoff our tyles using Tokens Studio, which generates tokens for fontFamily, fontWeight, lineHeight, fontSize, letterSpacing, paragraphSpacing, paragraphIndent, textCase and textDecoration. This allows us maximal control and flexibility. For instance, we are able to swap an entire font family from a single token, which can be pushed across all Figma files on one side, and to Github on the code size where the developer accepts the change across all code files in the products. It's true end-to-end synchronicity.