Add 'system-ui' as a generic family name
https://www.w3.org/TR/css-fonts-4/#valdef-font-family-system-ui
We could have some list of fonts for system-ui as well as other generic families.
https://www.w3.org/TR/css-fonts-4/#valdef-font-family-system-ui
We could have some list of fonts for system-ui as well as other generic families.