Solution for IOS?

Is there anyway for this to work on IOS?
It appears that none of the fonts in the list are the fonts used on IOS. Is that intentional?

When you call `font-family: system-ui` and you've used `@font-face { font-family: system-ui; }`, does that override the new browser standard `system-ui`? Would that mean, ignore this new generic `system-ui` (https://www.chromestatus.com/feature/5640395337760768) and use my font-face stack. Or does it mean, use the new generic `system-ui` and if that's not understood by the browser, run through this list of fonts in the font-face stack?

I'm finding this really hard to describe, sorry :(

Or to cover IOS with these font-face declarations should we just use something like `font-family: system-ui, sans-serif`.