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

Based on the feature description, the possible values of the feature `n_r_ecg_p_08` are "no" and "yes". In the context of the task, we are trying to determine if the patient shows chronic heart failure, which is a binary outcome (yes or no). 

Since there are only two possible values for the feature, it is straightforward to determine the relationship between the feature and the target. If the value of `n_r_ecg_p_08` is "yes", it suggests the presence of paroxysms of supraventricular tachycardia on the ECG at the time of admission, and this patient does show chronic heart failure. On the other hand, if the value is "no", it suggests the absence of such paroxysms, and this patient does not show chronic heart failure.

Therefore, the dictionary representing the relationship between the feature `n_r_ecg_p_08` and the target class would be as shown above. The key "no" represents the target class "no" (absence of chronic heart failure), and the value associated with it is a list containing the string "no". Similarly, the key "yes" represents the target class "yes" (presence of chronic heart failure), and the value associated with it is a list containing the string "yes".