how myaccount.google.com to put money off google play card on you iPhone to buy storages

Google Play cards are gift cards that let you make purchases from the Google Play Store (Google's version of the App Store and iTunes Store). You can't use them to purchase stuff from Apple, such as iCloud storage.

If you are paying Google for storage in their cloud, and your question concerns whether you can use your Google Play card to pay for that storage, that sounds like it would be something to ask Google about.