How would you transform a data frame cell that contains rows of json data in it into a flat data frame using spark scala

Ex:

People

{ "name":"John", "age":31, "city":"New York" }

{ "name":"Joan", "age":29, "city":"New York" }

{ "name":"Ray", "age":51, "city":"New York" }

To:

name	age	city
John	31	New York
Joan	29	New York
Ray	51	New York

Thanks!