a Hyperleger Smart Contract that is able to retrieve the history of updates for a certain key

demoContract.js

'use strict';

const { Contract } = require('fabric-contract-api');

class MyContract extends Contract {
  //add a member along with their email, name, address, and number
  async addMember(ctx, email, name, address, phoneNumber) {
    let member = {
      name: name,
      address: address,
      number: phoneNumber,
      email: email
    };
    await ctx.stub.putState(email, Buffer.from(JSON.stringify(member)));
    return JSON.stringify(member);
  }

  // look up data by key
  async query(ctx, key) {
    console.info('querying for key: ' + key);
    let returnAsBytes = await ctx.stub.getState(key);
    let result = JSON.parse(returnAsBytes);
    return JSON.stringify(result);
  }

  async retrieveHistory(ctx, key) {
    console.info('getting history for key: ' + key);
    let iterator = await ctx.stub.getHistoryForKey(key);
    let result = [];
    let res = await iterator.next();
    while (!res.done) {
      if (res.value) {
        console.info(`found state update with value: ${res.value.value.toString('utf8')}`);
        const obj = JSON.parse(res.value.value.toString('utf8'));
        result.push(obj);
      }
      res = await iterator.next();
    }
    await iterator.close();
    return result;
  }

}

module.exports = MyContract;

package.json

{
    "name": "jan22Test",
    "version": "0.0.9",
    "description": "My Smart Contract",
    "main": "index.js",
    "engines": {
        "node": ">=8",
        "npm": ">=5"
    },
    "scripts": {
        "lint": "eslint .",
        "pretest": "npm run lint",
        "test": "nyc mocha --recursive",
        "start": "fabric-chaincode-node start"
    },
    "engineStrict": true,
    "author": "John Doe",
    "license": "Apache-2.0",
    "dependencies": {
        "fabric-contract-api": "1.4.0",
        "fabric-shim": "1.4.0"
    },
    "devDependencies": {
        "chai": "^4.2.0",
        "eslint": "^5.9.0",
        "mocha": "^5.2.0",
        "nyc": "^13.1.0",
        "sinon": "^7.1.1",
        "sinon-chai": "^3.3.0"
    },
    "nyc": {
        "exclude": [
            "coverage/**",
            "test/**"
        ],
        "reporter": [
            "text-summary",
            "html"
        ],
        "all": true,
        "check-coverage": true,
        "statements": 100,
        "branches": 100,
        "functions": 100,
        "lines": 100
    }
}

Hi, using ctx.stub.getHistoryForKey(ctx, key) i am not being able to get transaction id. On changing owner it gives output as :
[
{
"color":"black",
"make":"Tesla",
"model":"S",
"owner":"Adriana",
"docType":"car"
},
{
"color":"black",
"docType":"car",
"make":"Tesla",
"model":"S",
"owner":"Sanjiv Ranjit"
}
]

How shall i retrieve transaction id as well?

Regards,
Sanjiv Ranjit