How to use google plus into a vuejs ionic project

Question

I'm working on an app with Vue.js and Ionic (Beta) and with capacitor. In all tutorial, we need to store variable with the cordova cli. cordova plugin add cordova-plugin-googleplus --variable REVERSED_CLIENT_ID=myreversedclientid

But I don't have the cordova cli.. I tried to store variable in package.json like this :

 "cordova": {
      "cordova-plugin-googleplus": {
        "REVERSED_CLIENT_ID": "xxx"
      }
  }

But it's don't work.. With no error alert or message.. I don't know how I can make it work..

Thx for your help !