```json
{
    "yes": [2.0, 4.0, 6.0, 8.0, 10.0],
    "no": [3.0, 5.0, 7.0, 9.0, 12.0]
}
```

Based on prior knowledge, it is assumed that the feature "Time" refers to the number of months since the first blood donation. The range of values for the feature can be arbitrary, depending on the specific context. 

After analyzing the relationship between the "Time" feature and the target task of "Did the person donate blood?", the following dictionary is generated:

Under the "yes" key, the list of float values [2.0, 4.0, 6.0, 8.0, 10.0] represents typical "Time" values for individuals who donated blood.

Under the "no" key, the list of float values [3.0, 5.0, 7.0, 9.0, 12.0] represents typical "Time" values for individuals who did not donate blood.