Table:
Golfer
Country
Wins
Match Play
Championship
Invitational
Champions

Tiger Woods
United States
18
3: 2003, 2004, 2008
7: 1999, 2002, 2003,
2005, 2006, 2007, 2013
8: 1999, 2000, 2001, 2005,
2006, 2007, 2009, 2013
—

Geoff Ogilvy
Australia
3
2: 2006, 2009
1: 2008
—
—

Darren Clarke
Northern Ireland
2
1: 2000
—
1: 2003
—

Ernie Els
South Africa
2
—
2: 2004, 2010
—
—

Hunter Mahan
United States
2
1: 2012
—
1: 2010
—

Phil Mickelson
United States
2
—
1: 2009
—
1: 2009

Ian Poulter
England
2
1: 2010
—
—
1: 2012

Based on the provided table, please extract the cells' values located at the specified positions, as denoted 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:
row 5 and column 5,
row 2 and column 7,
row 8 and column 4,
row 2 and column 5,
row 8 and column 2,
row 2 and column 4,
row 1 and column 5,

The extracted cell contents are listed below.
{"row_id":"5", "column_id":"5", "cell_value":"2: 2004, 2010"}
{"row_id":"2", "column_id":"7", "cell_value":"—"}
{"row_id":"8", "column_id":"4", "cell_value":"1: 2010"}
{"row_id":"2", "column_id":"5", "cell_value":"7: 1999, 2002, 2003,\n2005, 2006, 2007, 2013"}
{"row_id":"8", "column_id":"2", "cell_value":"England"}
{"row_id":"2", "column_id":"4", "cell_value":"3: 2003, 2004, 2008"}
{"row_id":"1", "column_id":"5", "cell_value":"Championship"}