Based on prior knowledge, the relationship between the feature "BloodPressure" and the task "Does this person have diabetes?" can be analyzed as follows:

Since hypertension (high blood pressure) is a risk factor for developing type 2 diabetes, it is reasonable to assume that individuals with higher diastolic blood pressure might be more likely to have diabetes. However, it is important to note that there is no direct causation between the two variables.

To generate the dictionary, we can select five typical values for each target class ('yes', 'no') based on common ranges for diastolic blood pressure. However, it is essential to consult medical guidelines for accurate ranges.

```json
{
    "yes": [80.0, 85.0, 90.0, 95.0, 100.0],
    "no": [70.0, 75.0, 78.0, 80.0, 82.0]
}
```