Do we want to utilize vertical space for this? I'd prefer the text to be vertical, similar to the layout in the lichobile app and on lichess.

Yes that would be better, and with a smaller font size too.

I also wanted to put the text vertically but the library FL Chart doesn't give this option. Should I create an issue on their GitHub ?

Yep, sure. If it's not too difficult you could maybe also submit a PR in their repo to boost the process? Otherwise I don't think we'll merge this, as to me vertical font is mandatory.

Perhaps we can still merge this after all, but font size should be smaller and if possible the lines thinner. Also they could be of same color as in lichess website.

I made the lines thinner and I took the same color that is in lichess website. I also made the font smaller.

Yep, sure. If it's not too difficult you could maybe also submit a PR in their repo to boost the process? Otherwise I don't think we'll merge this, as to me vertical font is mandatory.

Sure I'll look at their repo and try to make a PR.

I made the PR imaNNeo/fl_chart#1579.