basic text table justification

I’m trying to adjust vertical justification within a cell of a Writer text table from a basic macro. Either of these should achieve something, but they return ‘Property or method not found’.

oCell.VertJustify = 2
oCell.VertJustify = com.sun.star.table.CellVertJustify.BOTTOM

Perhaps they only apply in Calc. How can it be done in Writer?