if i understand correctly, you'd like the labels above the columns formatted with a %.
you're not actually using stacking columns, but that is where the orange labels are coming from (stacklabels). so, remove those and then use the default placement for the column labels.

column: {

  datalabels: {
    format: '{point.y:.1f}%',
    enabled: true,
    color: 'black'

  colorbypoint: true,
  borderwidth: 0

Related Query

More Query from same tag