How to format text infront of a datalabel in highchart?

I’m new to highchart and are currently trying to place text infront of a datalabel

in highchart you can format data to that a unit appears after the data

plotOptions: {
   series: {
       dataLabels: {
           enabled: true,
           format: {y} mm'
         }
     }
},

the following will place mm after all datalabels(example 144mm), however I wish to place the label in front of the datalabel(“`mm144“)

Reason being I wish to display a dollar sign in front of my data(e.g $100 would show up)

How can I accomplish this
Thankyou