The totals column on a waterfall with a date is always placed on the timeline somewhere. The totals isn't actually a part of the date timeline, it's an aggregated value and should be able to be marked as such.

Basic ask is for an additional tick that is customizable that represents the placement of the placement of the connected totals column.

Problem described more fully here:
https://github.com/highcharts/highcharts/issues/10458