ng-apimock protractor-plugin setting up port other than the especified in baseUrl

I am trying to run my e2e tests with the ng-apimock protractor-plugin over jasmine. My actual data api, the one I am trying to mock, runs in port 8000. Whereas, my angular application runs in port 4200.

Following what explained on README files https://github.com/ng-apimock/protractor-plugin, https://github.com/ng-apimock/core and migration steps https://github.com/mdasberg/ng-apimock:

The package.json has as devDependencies:

...
"@ng-apimock/core": "^1.0.21",
"@ng-apimock/protractor-plugin": "^1.0.14"
...

and I already ran npm install.

My protractor config (protractor.conf.js) file looks like:

...
exports.config = {
...
  plugins: [{package: '@ng-apimock/protractor-plugin'}],
  framework: 'jasmine',
  baseUrl: 'http://localhost:4200/'
...
};

My spec file (sign-in.e2e-spec.ts) looks like:

import {Client} from '@ng-apimock/base-client';
declare const ngApimock: Client;
...
describe('login', () => {
...
 it('displays an error message if the signIn fails', async () => {
   await ngApimock.selectScenario('login', 'wrong-credentials');
   ...
   });
...
});

My mock file login.mock.json:

{
  "name": "login",
  "isArray": true,
  "request": {
    "url": "/login",
    "method": "POST",
    "body": {
      "username": "^[a-zA-Z]{3,10}$",
      "password": "^[a-zA-Z]{3,10}$"
    }   
  },  
  "responses": {
    "ok": {
      "status": 200,
      "default": true
    },  
    "wrong-credentials": {
      "default": false,
      "status": 400 
    }   
  }
}

I am getting the following error:

Failed: An error occured while invoking http://localhost:4200/ngapimock/mocks that resulted in status code 404

I think, I have to specify the port 8000 at some point but I do not find where. I am not sure if the plugin configuration is right or not.