Thanks for using syncfusion product.
We have analyzed your query. We have created sample with the provided geojson data. The poygon shape for the given geojson data can be found from below screenshot.
You can create your required polygon shapes by passing appropriate json data to the sublayer property in map. More information on sublayer can be found from below link,
If the query is misunderstood, please kindly revert us.
For your reference we have attached the sample. Kindly fin the sample from below link,