Based on prior knowledge, the presence of a right ventricular myocardial infarction (IM_PG_P) can be a potential risk factor for chronic heart failure. To analyze the relationship between the feature and the task, we need to look at how the different categories of IM_PG_P are distributed among the patients with and without chronic heart failure.

To create the dictionary, we need to list the possible values of IM_PG_P for each target class (yes: chronic heart failure, no: no chronic heart failure).

Here is an example of how the dictionary could be constructed:

```json
{
	"no": ["no"], 
	"yes": ["yes"]
}
```

However, without further information about the specific values of IM_PG_P associated with chronic heart failure, it's difficult to determine the exact relationship. If there are additional values of IM_PG_P that are hard to predict or are not well-known risk factors for chronic heart failure, they can be excluded from the dictionary.