After analyzing the relationship between the feature "n_p_ecg_p_06" and the target variable "chronic heart failure", it is necessary to consider the following:

- The feature "n_p_ecg_p_06" represents the presence or absence of Third-degree AV block on ECG at the time of admission to the hospital.
- The presence of Third-degree AV block on ECG may be indicative of chronic heart failure. 

Based on this analysis, the dictionary would be:

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

This dictionary indicates that for the target class "no" (indicating no chronic heart failure), the possible values for the feature "n_p_ecg_p_06" are ["no"]. Similarly, for the target class "yes" (indicating chronic heart failure), the possible values for the feature "n_p_ecg_p_06" are ["yes"].

Since "n_p_ecg_p_06" is a categorical variable with limited possible values, there is no need to include values that are hard to predict.