src/vs/workbench/api/browser/mainThreadNotebook.ts/MainThreadNotebooks/$updateNotebookProviderOptions
class MainThreadNotebooks:	async $updateNotebookProviderOptions(viewType: string, options?: { transientOutputs: boolean; transientCellMetadata: TransientCellMetadata; transientDocumentMetadata: TransientDocumentMetadata }): Promise<void> {
		const provider = this._notebookProviders.get(viewType);

		if (provider && options) {
			provider.controller.options = options;
			this._notebookService.listNotebookDocuments().forEach(document => {
				if (document.viewType === viewType) {
					document.transientOptions = provider.controller.options;
				}
			});
		}
	}