Custom Template

Just extend appropriate template class and pass custom row/cell object to its constructor:

private static class MyCustomRow extends RowTemplate {

    public MyCustomRow(final String name, final String surname, final String id) {
        super(
            new XsRow()
                .with(new TextCells(name, surname))
                .with(new MyGreyCell(new TextCell(id)))
        );
    }
}

private static class MyGreyCell extends CellTemplate {

    public MyGreyCell(final ECell cell) {
        super(cell.with(
            new XsStyle(
                new ForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex()),
                new FillPattern(FillPatternType.SOLID_FOREGROUND)
            )
        ));
    }
}