How to add scale/axisLabel to radar? - echarts

I'm developing a radar chart using echarts v4 and I want to add a scale to it.
I already tried to add:
axisLabel: { show: true }
but it doesn't work.
So my question is: is there any solution for this issue.
Here is an example so you can check it for more details: https://jsfiddle.net/skhachoum/k9x5rvn7/15/
Thank you in advance :)

Yeah.. It's a bug of echart 4.0, and this is a bugfix, bug seems haven't release in last version.

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