Table:
Flower pots painted	Frequency

0	15

1	12

2	9

3	10

4	20

What is the content of the cell located in the 7th row and the 1st column of this table? 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 7th row and the 1st column is {"row_id":"7", "column_id":"1", "cell_value":"4"}.