I suppose i have got a work around for this.
In case you have such requirements, Instead of Using a Dounut Charts, you can use Gauge Chart.
Firstly select the inner area of the gauge and from the options remove the labels, minor & major tick marks. Secondly from gauge properties remove the Frame of the Gauge. Now U will be left over with only the "Range" part of the Gauge chart.You can add number of ranges to get the 360 Dounut look. You can specify each "Range" start & end range with hard code values or expression . Playing with the Range general properties, you can achieve the mentioned customization. You can add a Label to the Gauge and place it in the center