How to use the n8n-workflow.WorkflowDataProxy function in n8n-workflow

getNodeContext (workflow: Workflow, runExecutionData: IRunExecutionData | null, parentNode: string[], nodeName: string, filterText: string): IVariableSelectorOption[] | null {
				const inputIndex = 0;
				const itemIndex = 0;
				const inputName = 'main';
				const runIndex = 0;
				const returnData: IVariableSelectorOption[] = [];

				const connectionInputData = this.connectionInputData(parentNode, inputName, runIndex, inputIndex);

				if (connectionInputData === null) {
					return returnData;
				}

				const dataProxy = new WorkflowDataProxy(workflow, runExecutionData, runIndex, itemIndex, nodeName, connectionInputData);
				const proxy = dataProxy.getDataProxy();

				// @ts-ignore
				const nodeContext = proxy.$node[nodeName].context as IContextObject;
				for (const key of Object.keys(nodeContext)) {
					if (filterText !== undefined && key.toLowerCase().indexOf(filterText) === -1) {
						// If filter is set apply it
						continue;
					}

					returnData.push({
						name: key,
						key: `$node["${nodeName}"].context["${key}"]`,
						// @ts-ignore
						value: nodeContext[key],
					});

getWorkflowDataProxy: (): IWorkflowDataProxyData => {
				const dataProxy = new WorkflowDataProxy(workflow, runExecutionData, runIndex, itemIndex, node.name, connectionInputData);
				return dataProxy.getDataProxy();
			},
			getWorkflowStaticData(type: string): IDataObject {

getWorkflowDataProxy: (itemIndex: number): IWorkflowDataProxyData => {
				const dataProxy = new WorkflowDataProxy(workflow, runExecutionData, runIndex, itemIndex, node.name, connectionInputData);
				return dataProxy.getDataProxy();
			},
			getWorkflowStaticData(type: string): IDataObject {