Azurepipeline Extension- doesn't give any error nor able to show dynamic dropdown value

I have created an extension, pushed to Marketplace & then used it in my org all this went so smooth. then when I started building  Pipe line  at TASK step when I choose my extension it is populating a field that has options pre-defined. but when it comes to dynamic it says "Not Found" aka empty.

Details:-

Custom step has 3 fields.

1. Category- Cars [ pre defined option list ]
2. Color - Blue [ pre defined option list ]
3. Car List  - this used endpoint - https://gist.githubusercontent.com/Satyabsai/b3970e2c3d229de2c70f1def3007ccfc/raw/02dc6f7979a83287adcb6eeecddb5575bef3516e/data.json

******************** TASK.JSON file**************************** 

{
  "id": "d9bafed3-2b89-4a4e-89b8-21a3d8a4f1d3",
  "name": "TestExecutor",
  "friendlyName": "Execute ",
  "description": "Executes",
  "helpMarkDown": "",
  "category": "Test",
  "author": "s4legen",
  "version": {
    "Major": 5,
    "Minor": 4,
    "Patch": 0
  },
  "instanceNameFormat": "Execute Test Suite $(carlist)",
  "inputs": [
    {
      "name": "category",
      "type": "pickList",
      "defaultValue": "Web",
      "label": "Category",
      "required": true,
      "helpMarkDown": "Select the ",
      "options": {
        "mobile": "car",
        "web": "truck",
        "api": "Plan"
      }
    },
    {
      "name": "Color",
      "type": "pickList",
       "defaultValue": "Blue",
      "label": "color",
      "required": true,
      "helpMarkDown": "Select the ",
      "options": {
        "nonProd": "Blue",
        "prod": "Red"
      }
    },
    {
      "name": "Carlist",
      "type": "pickList",
      "defaultValue" :"BMWX7",
      "label": "Carlist",
      "required": true,
      "helpMarkDown": "Select the list to execute",
    "properties": {
      "EditableOptions": "true",
      "Selectable": "true",
      "Id": "CarInput"
    },
    "loadOptions": {
      "endpointUrl": "https://gist.githubusercontent.com/Satyabsai/b3970e2c3d229de2c70f1def3007ccfc/raw/02dc6f7979a83287adcb6eeecddb5575bef3516e/data.json",
      "resultSelector": "jsonpath:$[*]",
      "itemPattern": "{ \"value\": \"{value}\", \"displayValue\": \"{displayValue}\" }"
    }
    }
  ],
  "execution": {
    "Node16": {
      "target": "index.js"
    }
  },
  "messages": {
    "TestSuiteLoadFailed": "Failed to load test from endpoint. Using default options."
  }
}

**************

*************************

const tl = require('azure-pipelines-task-lib/task');
const axios = require('axios');

const TEST_ENDPOINT = 'https://gist.githubusercontent.com/Satyabsai/b3970e2c3d229de2c70f1def3007ccfc/raw/02dc6f7979a83287adcb6eeecddb5575bef3516e/data.json';

async function getValue(field) {
    if (field === 'Carlist') {
        try {
            const response = await axios.get(TEST_ENDPOINT, {
                timeout: 5000
            });
            
            return {
                options: response.data.map(item => ({
                    value: item.value,
                    displayValue: item.displayValue
                })),
                properties: {
                    "id": "CarlistDropdown"
                }
            };
            
        } catch (error) {
            tl.warning(tl.loc('TestLoadFailed'));
            
        }
    }
    return null;
}

async function run() {
    try {
        const color = tl.getInput('color', true);
        const category = tl.getInput('category', true);
        const carlist = tl.getInput('Carlist', true);
        
        const result = await axios.post(tl.getInput('clicQaEndpoint'), {
            testSuite,
            category,
            environment
        }, {
            timeout: 10000
        });
        
        tl.setResult(tl.TaskResult.Succeeded, `Execution ID: ${result.data.executionId}`);
    } catch (err) {
        tl.setResult(tl.TaskResult.Failed, err.message);
    }
}

module.exports = {
    run,
    getValue
};

********************

 CAN SOMEONE TELL ME WHAT JSON RESPONSE IS ACCPETABLE BY AZURE TO POPULATE DROPDOWN DYNAMICALLY SOURCE IS api