Based on my prior knowledge, I can analyze the relationship between the feature "campaign" and the target variable "subscription to a term deposit". The feature "campaign" represents the number of contacts performed during a campaign for a specific client.

For the target class "no", which indicates that the client did not subscribe to a term deposit, typical campaign values might be:
- 1.0
- 2.0
- 3.0
- 4.0
- 5.0

For the target class "yes", which indicates that the client subscribed to a term deposit, typical campaign values might be:
- 1.0
- 2.0
- 3.0
- 4.0
- 5.0

Based on this analysis, here is the dictionary representing the relationship between the "campaign" feature and the target variable:

```json
{
    "no": [1.0, 2.0, 3.0, 4.0, 5.0],
    "yes": [1.0, 2.0, 3.0, 4.0, 5.0]
}
```