score:0

you can also use renderer and add image in any position:

http://api.highcharts.com/highcharts#renderer.image()

score:1

it looks like there is a usehtml option for the yaxis labels configuration that allows the use of images.

http://api.highcharts.com/highcharts#yaxis.labels.usehtml

score:1

if you want to get at that element and modify it further, you can:

1.) get it through the chart object:

chart.yaxis[0].plotlinesandbands[0];

2.) or, find it in the dom by the text itself:

$('#container text:contains("plot line")') // where container is the id of the div container and "plot line" is the text of the plot line

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