langchain/utilities/powerbi.py/PowerBIDataset/get_schemas
class PowerBIDataset:    def get_schemas(self) -> str:
        """Get the available schema's."""
        if self.schemas:
            return ", ".join([f"{key}: {value}" for key, value in self.schemas.items()])
        return "No known schema's yet. Use the schema_powerbi tool first."