```json
{
	"no": ["no"],  
	"yes": ["yes"]
}
```
From the given feature description, the feature n_r_ecg_p_03 represents the presence or absence of ventricular contractions on the ECG at the time of admission to the hospital. 

By analyzing the feature in relation to the task of determining if the patient has chronic heart failure, we can infer the following:
- If the value of n_r_ecg_p_03 is "no", it indicates that there are no ventricular contractions on the ECG at the time of admission to the hospital.
- If the value of n_r_ecg_p_03 is "yes", it suggests that there are ventricular contractions on the ECG at the time of admission to the hospital.

Based on this analysis, the dictionary representation of the relationship between the feature n_r_ecg_p_03 and the target class (chronic heart failure) can be generated as shown above. The possible values of the feature for the target class "no" are ["no"], and for the target class "yes" are ["yes"].