So lets see. Suppose you do a Google Certification for AI|ML. This makes you an apt user of Google's AI platform. Your value lies not with Google but with other companies that want to use Google's platform for AI, ML work.
For specific AI,ML work(like developing the API that you are using), Google will hire PhDs and grad students who specialise in AI|ML. For engineering solutions of those products Google will hire software and distributed systems engineer. You will be hired by someone who wants to use Googles platform.