Task: Data-Imputation (source dataset: WebTable)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Payload specialist        | Mission   | Notes                                                                                          |
|:--------------------------|:----------|:-----------------------------------------------------------------------------------------------|
| Ulf Merbold               | STS-9     | first payload specialists, Ulf Merbold was the first international (German) payload specialist |
| Byron K. Lichtenberg      | STS-9     | first payload specialists, Ulf Merbold was the first international (German) payload specialist |
| Charles D. Walker         | STS-41-D  | first non government-affiliated payload specialist                                             |
| Marc Garneau              | STS-41-G  | Garneau was the first Canadian in space, Scully-Power the first Australian                     |
| Paul Scully-Power         | STS-41-G  | Garneau was the first Canadian in space, Scully-Power the first Australian                     |
| Gary Payton               | STS-51-C  | first military payload specialist                                                              |
| Charles D. Walker         | STS-51-D  | nan                                                                                            |
| Jake Garn                 | STS-51-D  | then-U.S. Senator, first U.S. legislative branch payload specialist                            |
| Lodewijk van den Berg     | STS-51-B  | nan                                                                                            |
| Taylor Wang               | STS-51-B  | nan                                                                                            |
| Patrick Baudry            | STS-51-G  | two international payload specialists                                                          |
| Sultan bin Salman Al Saud | STS-51-G  | two international payload specialists                                                          |
| Loren Acton               | STS-51-F  | nan                                                                                            |
| John-David F. Bartoe      | STS-51-F  | nan                                                                                            |
| William A. Pailes         | STS-51-J  | nan                                                                                            |
| Reinhard Furrer           | STS-61-A  | three international payload specialists, most payload specialists on a single flight           |
| Ernst Messerschmid        | STS-61-A  | three international payload specialists, most payload specialists on a single flight           |
| Wubbo Ockels              | STS-61-A  | three international payload specialists, most payload specialists on a single flight           |
| Rodolfo Neri Vela         | STS-61-B  | first Mexican in space                                                                         |
| Charles D. Walker         | STS-61-B  | Walker's third and final spaceflight                                                           |
| [MISSING]                 | STS-61-C  | nan                                                                                            |
| Bill Nelson               | STS-61-C  | then-U.S. Representative, second and final U.S. legislative branch payload specialist          |
| Gregory Jarvis            | STS-51-L  | killed in the Challenger disaster                                                              |
| Christa McAuliffe         | STS-51-L  | killed in the Challenger disaster                                                              |



row_idx: 20
col_idx: 0
col_name: Payload specialist
label: Robert J. Cenker