Lv_chart add different spacing division lines

I try to add series as limit line, but if the chart point show more, the lv_chart will use cpu very high.

I find the demo eample lv_example_chart_2, but it jsut can vertical isometric and change color.
I want to do this link style. division lines with different spacing.
Does anyone know how to do it?

I finsh this work, by create a new line mode.