The field contains a JSON object according to GeoJSON or TopoJSON spec. Read more in Table Schema Standard.
from frictionless import Schema, extract, fields
data = [['name'], ['{"geometry": null, "type": "Feature", "properties": {"k": "v"}}']]
rows = extract(data, schema=Schema(fields=[fields.GeojsonField(name='name')]))
print(rows)
{'memory': [{'name': {'geometry': None, 'type': 'Feature', 'properties': {'k': 'v'}}}]}
Field representation
(*, name: str, title: Optional[str] = None, description: Optional[str] = None, format: str = default, missing_values: List[str] = NOTHING, constraints: Dict[str, Any] = NOTHING, rdf_type: Optional[str] = None, example: Optional[str] = None, schema: Optional[Schema] = None) -> None