Variable width font

I was excited to see that Source Code Pro had a variable option, until I saw that it doesn't have support for variable widths. Any chance that support could be added?

(Or if anyone has suggestions for a similar narrow/condensed/ultra-condensed mono font I'd love to have them. Ideally 80% of the width of SCP or less.) Edit: I found Iosevka and am trying it out now. I'm not sure I like its letterforms quite as much as SCP though.