How to have a slider in flutter with specific divisions

Question

I want to have a slider in flutter with numbers like .5,1,2,3,4,5,10,15. How is this possible. I know that the divisions creates divisions in the slider that are linear. Is this possible to have my own numbers as each dot instead of a linear slider?

Slider(
  value: seconds,
  max: 3600,
  divisions:
      120, // this is where i want to have a not a linear division
  label: (seconds / 60.0).toStringAsFixed(1),
  onChanged: (double value) {
    setState(() {
      seconds = value;
    });
  },
),