Combo Chart - Manually define steps/ticks value on the Y-axis

We have a combo chart that is utilising a time-based metric for the y-axis (between 00:00 and 24:00, which represent 0 and 1 respectively).

We are attempting to show the Y-Axis to increment in steps of 6 hours (06:00, 12:00, 18:00, 24:00) or alternatively in 3 hours (03:00, 06:00 etc.) where the max value would be 12:00. The issue we have is that this results in odd looking axis values (see chart below). This includes changing the tick count to an appropriate estimated value (i.e., 4), but this doesn’t produce the desired result either (rounds up to 6 steps/ticks).

In QlikView, it is possible to manually define the step count value. It would be great if similar functionality would be available in these charts for QlikSense.