titlePositionPercentageOffset property
the titlePositionPercentageOffset is the place of showing title on the RadarChart The higher the value of this field, the more titles move away from the chart. this field should be between 0 and 1, if it is 0 the title will be drawn near the inside section, if it is 1 the title will be drawn near the outside of section, the default value is 0.2.
Implementation
final double titlePositionPercentageOffset;