SurveyCreator: NoUiSlider, how can I introduce more complex initialization parameters

Hi,
I'd like to edit some questions containing the NoUISlider.
In particular to be able to access the format property of the noUISlider options to do something like this:

JavaScript
var aproximateHour = function (mins){
    if (mins >= 1440) {
        mins -= 1440;
    }
    var minutes = Math.round(mins % 60);
    if (minutes == 60 || minutes == 0) { return mins / 60;}
    return Math.trunc (mins / 60) + minutes / 100;
}

noUiSlider.create(noUISliderItem, {
  start : 240,
  behaviour: 'tap-drag', 
  step: 15,
  tooltips: true,
  range : {'min': 1200, 'max': 1620},
  format:  wNumb({
        decimals: 2,
    mark: ":",
        encoder: function(a){
       return aproximateHour(a);
      }
    }),
  pips: {
    mode : 'steps',  
    format:  wNumb({
    decimals: 0,
        encoder: function(a ){
        return aproximateHour(a);
      }
        }),
      filter : filter_hour,
      stepped : true,
    density:4
  }
});
function filter_hour(value, type) {
    return (value % 60 == 0) ? 2 : 0;
}