Can ColumnView rows have expandable child rows?

Using Python 3.10, GTK 4.6.4

I’m porting a large GTK3 application to GTK4, nearing the end, but have just hit a snag. I’ve hit a TreeView that has expandable/collapsible children rows (i.e. the TreeStore iter has child iters). The TreeView uses some custom CellRenderers that crash spectacularly in GTK4, so I need to convert this to a ColumnView.

I have never attempted a ColumnView that has expandable child rows – is that possible, and would anyone be so kind as to explain how, or point me to some documentation or examples?

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