Currently using the drawTime: beforeDatasetsDraw option to ensure the first dataset is drawn on top of the line annotation (I'm using plugin to draw a y = 0 line).

I'd like to add a second dataset that gets drawn under the line annotation, the use case is that I'm using the fill: 0 option for this dataset so the line annotation should take preference.

The z index order ASC should be:
dataset #2 (using fill up to dataset #1)
line annotation (y = 0)
dataset #1 (not filled, just a line)

Is this possible? I assume the z index option is only in relation to other annotations and nothing to do with datasets.
I'm using chart.js v4.3.0 and v2.2.1 of the plugin.