Radar Chart

The data format for radar chart per-series is also similar but instead of x values they are variables and instead of y values they are the only values for the variables with type of Numeric.

{
  <variable> => <value>,
  <variable> => <value>,
  ...
}

or this:

[
  [<variable>, <value>],
  [<variable>, <value>],
  ...
]