It definitely can help. In my experience, finding these kinds of bugs can help you get the interview, but it doesn't necessarily help that much once you get to the interview since the interview process is still standardized and focuses on evaluating you across a number of different areas (not just vulnerability research). But it definitely helps get some good attention!
Disclosure: I work at Google on their security team and reported a number of bugs to their VRP before I got hired.
Disclosure: I work at Google on their security team and reported a number of bugs to their VRP before I got hired.