The cellAriaLabel column config only accepts a static string, which is applied uniformly to all cells in a column via Column.updateCellAriaLabel(). This method is called on every cell focus event (onCellFocus), overwriting any aria-label set during the column's renderer callback.
In data grids where each cell needs to announce unique context (e.g., a comparison grid where each cell must announce the row criterion, cell value, and match status alongside the column header), there is no supported way to set a per-cell aria-label that Bryntum will respect.
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