I would like to recommend inclusion/prioritisation of the wind rose chart into your development plan. From what I can see in the documentation, it is not possible to implement this using the current radar chart - but it is close in some respects.
To see what a wind rose chart is just put "wind rose chart" into google. The typical use is to display the distribution of wind directions during a time period.
The curent radar chart can do some of this but misses out on vital stuff vs competing charting products.
So in summary, if a radar chart is a circular multi-series line chart, then a wind rose chart could be a circular multi-series stacked column chart. (best way of describing it)
If it is possibe to achieve this using the radar chart, please let me know. [Otherwise we will have to introduce an alternative solution ]