Based on prior knowledge, the feature capital-gain can provide insights into whether a person earns more than $50,000 per year or not. 

If a person has a high capital-gain, it indicates that they have made significant profits or gains on their investments or assets, which suggests a higher income. On the other hand, if the capital-gain is low or zero, it may indicate a lower income.

To generate the dictionary, I will provide typical capital-gain values for each target class ('no' and 'yes'):

```json
{
	"no": [0, 100, 500, 1000, 2000],
	"yes": [5000, 10000, 15000, 20000, 25000]
}
```

These values are just examples and should be adjusted based on the specific distribution and ranges of capital-gain in the dataset.