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How should I use system-fonts now?

I’m using system-font on some of my prototypes. The way I achieved this was with custom code and then using Arial in the editor (meaning I didn’t override the default font ever). Now it seems that with the recent style panel update I cannot choose any weights other than what’s available for a specific font (system-fonts can handle 500 when Arial doesn’t). This ultimately limits me to use only 400 or 700. What is the best way to override this?