After analyzing the relationship between the feature "Insulin" and the task "Does this person have diabetes?", there is a strong prior knowledge that insulin levels can indicate the presence of diabetes. 

Based on this knowledge, we can assume that individuals with higher insulin levels are more likely to have diabetes, while those with lower insulin levels are less likely to have diabetes.

The dictionary with the Insulin values for each target class can be formatted as follows:

```json
{
	"yes": [15.0, 25.0, 30.0, 40.0, 50.0],  
	"no": [5.0, 8.0, 10.0, 12.0, 18.0]   
}
```

In this example, the values [15.0, 25.0, 30.0, 40.0, 50.0] represent typical insulin levels for individuals who have diabetes (target class 'yes'). Conversely, the values [5.0, 8.0, 10.0, 12.0, 18.0] represent typical insulin levels for individuals who do not have diabetes (target class 'no').