y2 axis format example

config.js

{
  options: {
    data: {
      axes: {
        "data1": 'y',
        "data2": 'y2'
      },
    },
    axis: {
      y2: {
        show: true,
        tick: {
          format: function(v) { return "$" + v }
        }
      }
    }
  }
}

example.data.json

{
  "options": {
    "data": {
      "columns": [["data1", 0,1,2,3], ["data2", 0,6,8,10]]
    }
  }
}

image.md

The image: