Table:
Language	Number of books

Russian	840

Hindi	390

Vietnamese	260

Analyze the provided table and extract the contents of cells located at the specified positions, identified by row and column indices. Provide the value of all target cells in the JSON structure, using the format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.
Positions:
the 2nd row and the 1st column,
the 5th row and the 2nd column,
the 2nd row and the 2nd column,
the 1st row and the 2nd column,

The extracted cell contents are listed below.
{"row_id":"2", "column_id":"1", "cell_value":"Language"}
{"row_id":"5", "column_id":"2", "cell_value":"260"}
{"row_id":"2", "column_id":"2", "cell_value":"Number of books"}
{"row_id":"1", "column_id":"2", "cell_value":"Foreign language books"}