Table:
Changsha

长沙市

• Prefecture-level city	7,431,800
• Density	630/km2 (1,600/sq mi)
• Urban

(2018)

4,020,000
• Urban density	5,400/km2 (14,000/sq mi)
• Metro

4,597,134
• Rank in China

19th

the 7th row and the 2nd column
Extract the content of cell in the above position, identified by row and column indices. The target cell value should be presented in the JSON format of {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}, e.g., {"row_id":"10", "column_id":"3", "cell_value":"District"}.

The target cell value in the 7th row and the 2nd column is {"row_id":"7", "column_id":"2", "cell_value":"19th"}.