src/vs/workbench/contrib/notebook/common/model/notebookCellOutputTextModel.ts/NotebookCellOutputTextModel/toJSON
class NotebookCellOutputTextModel:	toJSON(): IOutputDto {
		return {
			// data: this._data,
			metadata: this._rawOutput.metadata,
			outputs: this._rawOutput.outputs,
			outputId: this._rawOutput.outputId
		};
	}