Table:
soy flour	$5 per lb

unbleached white flour	$5 per lb

peanut flour	$4 per lb

whole wheat flour	$2 per lb

bleached white flour	$2 per lb

the 4th row and the 1st column
Extract the content of cell in the above position, identified by row and column indices. Format the cell value as a JSON, using the structure {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.

The target cell value in the 4th row and the 1st column is {"row_id":"4", "column_id":"1", "cell_value":"whole wheat flour"}.