You are looking for the attribute offsetR  which works like padding. The is located inside the scaleR  object, which is the scale used for radial charts. Inside 'scaleR' adjust the numerical values by adding the attribute within the 'item' object.

scaleR:{
  item:{
    offsetR:45
  }
}

Example: https://demos.zingchart.com/view/5CE8C8AE 

Documentation

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