Based on prior knowledge, we can analyze the relationship between the feature "n_p_ecg_p_07" (LBBB on ECG at the time of admission to the hospital) and the target variable of chronic heart failure.

LBBB (Left Bundle Branch Block) is an abnormality seen on an electrocardiogram (ECG) that represents delayed electrical activation of the left ventricle of the heart. It indicates a problem with the electrical conduction system of the heart and can be associated with various heart conditions, including chronic heart failure.

To analyze the relationship between "n_p_ecg_p_07" and chronic heart failure, we need to analyze the distribution of values in the feature for both classes of the target variable (yes and no). By examining the values, we can determine if there is a significant association between LBBB and chronic heart failure.

Here is the dictionary with the analysis of the relationship:

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

In this case, there are two possible values for the feature: "no" and "yes." Based on the information provided, the presence of LBBB (indicated by the value "yes") suggests an increased likelihood of chronic heart failure.

It is important to note that in the case of analyzing the relationship between a feature and a target variable, it is crucial to consider other factors, perform statistical tests, and conduct a more comprehensive analysis to make a definitive conclusion. The given analysis is based on the provided information.