How to implement flex-grow?

Hi PP newbie here, just trying to wrap my head around how much of the CSS Spec PP has implemented.

I see that with Flex Grid we can set fractional dimensions and we can also create spans.

But one of the most basic features of CSS Flexbox is flex-grow on individual elements. I had expected to find this on Flex layout frames as well, but I’m struggling to find any mention of it in the official documentation.

Can someone point me to how this is accomplished? And I guess, if it’s not implemented, help me understand why the spec is not complete?

Thanks in advance!

There’s no specific option to manage flex-grow and its related properties right now. Someone on the team will be better at answering the why of which parts of the spec have been implemented.

Do you have any specific cases you use flex-grow for? I’ve not used it loads in designs as I tend to lean more heavily on either content or container-based sizing. But I think support could really benefit truly responsive designs, especially alongside feature support for breakpoints and a responsive preview mode.