Based on my prior knowledge, the MHG (Thousand seed weight) feature can be analyzed to determine its relationship with the grain yield of the soybean cultivar.

Analysis:
Typically, a higher thousand seed weight (MHG) is associated with higher grain yield, while a lower MHG is associated with lower grain yield.

Based on this analysis, I will generate a dictionary with 5 typical MHG values for each target class ('low' and 'high').

```json
{
	"low": [0.9, 1.2, 1.5, 1.7, 2.0],
	"high": [2.5, 2.8, 3.0, 3.2, 3.5]
}
```

Please note that these values are hypothetical and represent examples of typical MHG values in each target class ('low' and 'high'). Actual values may vary based on the specific dataset and context.