Fixed DataLabels in Pie Chart ChartJS

I am using ChartJS for my Lucky Spin Wheel, I have used Pie Chart to create wheel, Now I put datalabels according to requirement, and rotated that with following code

rotation: function(ctx) {
   const valuesBefore = ctx.dataset.data.slice(0, ctx.dataIndex).reduce((a, b) => a + b, 0);
   const sum = ctx.dataset.data.reduce((a, b) => a + b, 0);
   const rotation = ((valuesBefore + ctx.dataset.data[ctx.dataIndex] /2) /sum *360);
   return rotation < 180 ? rotation-90 : rotation+90;
}

They are coming as expected, But when I spin the wheel with

myChart.options.rotation = myChart.options.rotation + resultValue;
myChart.update()

Here resultValue is fixed 101, and after spinning the datalabels position also changed and not as expected, following are the images

Is there any way we can restrict datalables rotation?