Table:
Position
Officer[1]
current officers
superseded by
Royal Household[2]

1
Lord High Steward
vacant
Justiciar
Lord Steward

2
Lord High Chancellor
The Rt Hon Chris Grayling, MP

3
Lord High Treasurer
in commission

4
Lord President of the Council
The Rt Hon Nick Clegg, MP

5
Lord Privy Seal
The Rt Hon Andrew Lansley, CBE, MP

6
Lord Great Chamberlain
The Marquess of Cholmondeley
Lord High Treasurer
Lord Chamberlain

7
Lord High Constable
vacant
Earl Marshal

Master of the Horse

8
Earl Marshal
The Duke of Norfolk

9
Lord High Admiral
HRH The Duke of Edinburgh

There is a cell located in row 8 and column 3 in this table, identify this cell and report its content. Show the cell value in the JSON format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.

The target cell value in row 8 and column 3 is {"row_id":"8", "column_id":"3", "cell_value":"vacant"}.