About 15% is slåtter and grazeland. Slåtter might include some grazing, but the vast majority of things growing there won't be eaten. I think it is pretty safe to say that the vast majority of the grass feed land is suitable for human crops since "vall" is most often used in rotational crop systems.

We CAN grow such crops in Sweden, at least in the southern parts. I lived next to a quinoa field with comparatively high yields. And we have been growing white beans for years. Pre pandemic there were trials with soybeans on Öland and in Skåne with promising results.