How to get workflowInstanceId and taskId in workflow execution

[butani79]

Below are two task of one of the workflows, the use case we are trying is, when HTTP task should send workflowInstanceId and HUMAN(which is followed by HTTP) taskId to HTTP-API, so that human can login to Application and get the workflow approved.
One of the discussion suggested to use ${dispatch_approval.taskId} but this always returns null and ${order_processor.workflowInstanceId} this as well.
"WorkflowId":"${order_processor.workflowInstanceId}",
"TaskId":"${dispatch_approval.taskId}"

Can someone guide how such information can be fetched during workflow execution?

{ "name": "fullfill_order_for_medicine", "taskReferenceName": "fullfill_order_for_medicine", "inputParameters": { "http_request": { "uri": "http://localhost:9999/orders", "method": "PUT", "body": { "id": "${get_order_request.output.response.body.id}", "name": "${get_order_request.output.response.body.name}", "status": "complete", "isComplete": true, "WorkflowId":"${order_processor.workflowInstanceId}", "TaskId":"${dispatch_approval.taskId}" } } }, "type": "HTTP" }, { "name" : "dispatch_approval", "taskReferenceName": "dispatch_approval", "type": "HUMAN" }