After analyzing the relationship between the 'existing_credits' feature and the target variable of whether the person receives a credit or not, here is the generated dictionary:

```json
{
  "yes": [0.0, 2.0, 3.0, 4.0, 5.0],
  "no": [1.0, 6.0, 7.0, 8.0, 9.0]
}
```

For the 'yes' class, possible values of 'existing_credits' could be 0.0, 2.0, 3.0, 4.0, and 5.0. These values indicate the number of existing credits at the bank for people who do receive a credit.

For the 'no' class, possible values of 'existing_credits' could be 1.0, 6.0, 7.0, 8.0, and 9.0. These values indicate the number of existing credits at the bank for people who do not receive a credit.