Echarts labels z index goes lower than lines

I control my labels with click and use multi-graphs with axisPointer with xAxisIndex to ‘all’and triggerEmphasis to true. The problem is that emphaphis axisPointer put the lines over my labels:
Overprinted label

I would like that my labels stay up to higher z index over the graphs line, like here:
higher label z index
When my mouse go out from emphasis for exemple on rulers, the labels stay up over line.
Is it possible to control the axisPointer behavior ?

Here the config setup: https://gist.github.com/electroheadfx/71827f8b8a997f99ac29e2768dfc3798