Based on prior knowledge, a heart rate below 60 at the time of admission to the hospital (ritm_ecg_p_08 = "yes") can be indicative of chronic heart failure in the context of myocardial infarction complications. However, a heart rate above 60 (ritm_ecg_p_08 = "no") does not necessarily rule out the presence of chronic heart failure. Therefore, it is important to analyze the relationship between the feature and the task more comprehensively.

To generate the dictionary, we need to analyze the values of feature ritm_ecg_p_08 for each target class (yes and no).

Here is the dictionary:

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

Since ritm_ecg_p_08 is a categorical variable, it only takes two possible values: "yes" and "no". For the target class "no", the only possible value of ritm_ecg_p_08 is "no", while for the target class "yes", the only possible value of ritm_ecg_p_08 is "yes".

Please note that this analysis assumes that the feature ritm_ecg_p_08 is solely indicative of chronic heart failure in the given context of myocardial infarction complications. Other factors may contribute to the overall diagnosis, and further analysis would be necessary to determine the significance of this feature in relation to the task.