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You can add one more line graph inside your scatter graph the same as you have drawn the existing line.
Data for that graph will the co-ordinates of bubble {x: bubble co-ordinate} and point on the line {y: point on the line}
{
data: [{
x: value1,
y: minimum-value // according to your requirement
}, {
x: value1,
y: average-value
}
],
borderColor: 'black',
borderDash : [5,5]
borderWidth: 1,
fill: false,
showLine: true,
pointRadius : 0,
datalabels: {
display: false
}
}
Source:stackexchange.com