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

Based on the given feature "n_r_ecg_p_06" and the task of determining if the myocardial infarction complications data shows chronic heart failure, it appears that the only possible value for this feature is either 'no' or 'yes'. As a result, for the target class "no", the only possible value for this feature is ["no"], and for the target class "yes", the only possible value for this feature is ["yes"].