[Feature] Line based sorting in legend

### What problem does this feature solve?

As seen in the image, I am displaying a chart with a legend. Since the legend shows quite a few values, echarts seems to create multiple lines for the entries, which is perfectly fine.

The issue comes from the sorting. Currently, the sorting iis column-based, the ascending values in the legend are first ascending within a column, like this:
1, 3, 5,
2, 4, 6

. I would love to be able to have the values sorted in lines, like this:
1, 2, 3,
4, 5, 6

Is this somehow doable, and I am missing something?
I could change the orientation to horizontal, but then I would only see a single line.

### What does the proposed API look like?

Maybe an additional parameter in the legend block?