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

Based on the feature description, the feature n_p_ecg_p_07 represents the presence of LBBB (anterior branch) on ECG at the time of admission to the hospital. For the task of determining whether the patient has chronic heart failure, it is important to analyze how this feature is related to chronic heart failure.

However, the provided feature description does not provide information about the relationship between n_p_ecg_p_07 and chronic heart failure directly. To determine this relationship, additional information or data is required.

In the absence of specific evidence, it is not possible to determine the relationship between n_p_ecg_p_07 and chronic heart failure. Therefore, the possible values of the n_p_ecg_p_07 feature for each target class (no and yes) cannot be determined with certainty. As a result, the dictionary provided above includes the possible values of n_p_ecg_p_07 ("no" and "yes") for each target class, but it cannot guarantee that these values are accurate or exhaustive.