Task: Data-Imputation (source dataset: tablib)

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:
| site_code   |   soil_depth |   n_layers |   layer_depth | layer_sand%   |   layer_clay% |
|:------------|-------------:|-----------:|--------------:|:--------------|--------------:|
| US-Blo      |       -999   |          1 |          -999 | 60.0          |         11    |
| US-CHATS    |       -999   |          1 |          -999 | 10.0          |         35    |
| US-FPe      |       -999   |          1 |          -999 | 47.0          |         21    |
| CA-Let      |       -999   |          1 |          -999 | 28.0          |         36    |
| US-NR1      |       -999   |          1 |          -999 | 43.13         |         21.43 |
| CA-Man      |       -999   |          1 |          -999 | 33.0          |         33    |
| BR-Sa1      |       -999   |          1 |          -999 | 19.0          |         65    |
| BR-Sa3      |       -999   |          1 |          -999 | 52.0          |         40    |
| ES-ES1      |       -999   |          1 |          -999 | 82.0          |          5    |
| FL-Hyy      |       -999   |          1 |          -999 | 82.0          |          5    |
| FL-Kaa      |       -999   |          1 |          -999 | [MISSING]     |         18    |
| IT-Col      |       -999   |          1 |          -999 | 22.0          |         13    |
| IT-Cpz      |       -999   |          1 |          -999 | 82.0          |          5    |
| DE-Tha      |       -999   |          1 |          -999 | 42.0          |         18    |
| US-Brw      |       -999   |          1 |          -999 | 50.0          |         25    |
| BE-Vie      |       -999   |          1 |          -999 | 42.0          |         18    |
| US-ARM      |       -999   |          1 |          -999 | 28.0          |         43.1  |
| US-Var      |       -999   |          1 |          -999 | 30.0          |         13    |
| US-UMB      |       -999   |          1 |          -999 | 92.6          |          0.6  |
| US-Ha1      |       -999   |          1 |          -999 | 66.0          |          6    |
| US-Ho1      |          0.8 |          1 |          -999 | 50.3          |         15.9  |
| US-MMS      |       -999   |          1 |          -999 | 34.0          |         63    |
| US-Bo1      |       -999   |          1 |          -999 | 5.0           |         25    |
| CA-Ca1      |       -999   |          1 |          -999 | 84.42         |          2.63 |
| CA-Oas      |       -999   |          1 |          -999 | 50.32         |         18.8  |
| CA-Obs      |       -999   |          1 |          -999 | 80.89         |          4.12 |
| CA-Ojp      |       -999   |          1 |          -999 | 94.47         |          2.5  |
| CA-Qfo      |       -999   |          1 |          -999 | 51.5          |          4    |
| US-Dk2      |       -999   |          1 |          -999 | 54.43         |         21.62 |
| US-Dk3      |       -999   |          1 |          -999 | 51.59         |         13.66 |
| US-IB1      |       -999   |          1 |          -999 | 7.8           |         37.2  |
| US-Me4      |       -999   |          1 |          -999 | 66.0          |         10    |
| US-Me2      |       -999   |          1 |          -999 | 67.0          |          7    |
| US-MOz      |       -999   |          1 |          -999 | 46.38         |         24.68 |
| US-Ne3      |       -999   |          1 |          -999 | 30.7          |         31.68 |
| US-WCr      |       -999   |          1 |          -999 | 42.52         |         20.17 |
| TS-Ts1      |       -999   |          1 |          -999 | 43.13         |         21.43 |
| TS-Ts2      |       -999   |          1 |          -999 | 43.13         |         21.43 |
| TS-Ts3      |       -999   |          1 |          -999 | 43.13         |         21.43 |
| LTER-Sev    |       -999   |          1 |          -999 | 52.0          |          5    |
| RF-Bra      |       -999   |          1 |          -999 | -999.0        |       -999    |
| LBA-Cax     |       -999   |          1 |          -999 | 75.0          |         20    |



row_idx: 10
col_idx: 4
col_name: layer_sand%
label: 42.0
output: value: 42.0
tablib_key: tables/job=github_000005/batch=008354/PhbBFao5vopDieV8EdoNMZ7rbBbXLKH_VQH-U11-iiA=