public class Stock {
    private String name;
    private List<StockDayRating> stockDayRating;
    public String getName() {
        return name;
    }
    public List<StockDayRating> getStockDayRating() {
        return stockDayRating;
    }
}

public class StockDayRating {
    private String close;
    public String getClose() {
        return close;
    }
}

grid.addColumn(Stock::getStockDayRating).setCaption("Value");

grid.addColumn(Stock::getStockDayRating::getClose).setCaption("Value");

public <V> Grid.Column<T, V> addColumn(ValueProvider<T, V> valueProvider) {
        return this.addColumn((ValueProvider)valueProvider, (AbstractRenderer)(new TextRenderer()));
    }