You can use two same series. Something like this:
series: [{
name: 'Delivered amount',
data: [
['31%', 31],
['25%', 25],
['22%', 22],
['15%', 15],
['7%', 7]
],
size: '60%',
dataLabels: {
formatter: function() {
return this.y
},
distance:10
}
},{
name: 'Delivered amount',
data: [
['3', 31],
['2', 25],
['2', 22],
['5', 15],
['7', 7]
],
size: '60%',
dataLabels: {
formatter: function() {
return this.point.name
},
color: 'white',
distance:-10
}
}]