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

Based on the given feature description, the feature "zab_leg_02" represents whether the patient has chronic bronchitis in their medical history or not. To analyze the relationship between this feature and the presence of chronic heart failure, we can observe that the feature has only two possible categories: "no" and "yes". 

From the available information, it is not possible to determine a specific relationship between the feature and the target class for chronic heart failure. Therefore, the possible values of "zab_leg_02" for each target class can be directly derived from the feature description itself:

- For the target class "no" (indicating no chronic heart failure), the only possible value of "zab_leg_02" is "no".
- For the target class "yes" (indicating the presence of chronic heart failure), the only possible value of "zab_leg_02" is "yes".

Thus, the dictionary representation of the possible values of "zab_leg_02" for each target class is as follows:

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

Please note that since "zab_leg_02" has only two possible categories, the lists contain only one element each.