Based on prior knowledge, in patients with chronic heart failure, frequent premature ventricular contractions on ECG at the time of admission to the hospital (feature n_r_ecg_p_04) may be more likely to occur. Therefore, a possible relationship between the feature and the task could be:

If the patient has chronic heart failure, there may be a higher chance of frequent premature ventricular contractions (n_r_ecg_p_04 = 'yes') at the time of admission to the hospital.

To create the dictionary with the specific details, we can list the possible values of the feature n_r_ecg_p_04 for each target class:

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