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

Based on the given feature description and the task, it seems that the presence of LBBB (anterior branch) on ECG at the time of admission to the hospital is being evaluated to determine if the patient has chronic heart failure (CHF). 

Since the feature is categorical with only two possible values ("no" and "yes"), we can simply create a dictionary where the key "no" represents the target class of patients without chronic heart failure, and the key "yes" represents the target class of patients with chronic heart failure. In this case, the values of the n_p_ecg_p_07 feature for each target class are single-item lists containing the respective category.

Note: If there were additional values for the feature that were hard to predict or not relevant to the task, they would not be included in the dictionary. However, for this particular feature and task, it seems that the only relevant values are "no" and "yes".