Based on my prior knowledge and analysis, the feature "ritm_ecg_p_04" which represents the ECG rhythm at the time of admission to the hospital can provide some information about the presence of chronic heart failure in the patient.

To generate the dictionary, we need to examine the different categories of the "ritm_ecg_p_04" feature for each target class.

Here is the dictionary for the given task:

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

In this case, since the feature "ritm_ecg_p_04" has only two possible categories ('no' and 'yes'), we can safely assume that if the value is 'no', it indicates no chronic heart failure, and if the value is 'yes', it indicates chronic heart failure.

Therefore, the dictionary includes the possible values of the feature for each target class, as follows:
- Target class "no" has only one value, which is "no".
- Target class "yes" has only one value, which is "yes".

Please note that we include all possible values of the feature for each target class, even though in this case there is only one value per target class.