POST requests: Send objects in FormData

[Ashesh Ambasta]

I have a simple use case where I have to POST to an API that expects complex objects in the form;

For example, it expects objects like (json);

opening_hours: {
  monday: ["5:00_1_open", "09:00_1_closed", "12:00_1_open", "21:00_1_closed"],
  tuesday: "closed"
},
picture: {
  url: "http://somewhere.com/picture.jpg"
}

You get the flow. I've been using FormData to create send form parameters, but it only accepts parameters of type Map[String, String]. What's the best way to overcome this?