How to fill json file and send it to firebase in flutter?

Question

I'm a Flutter programmer and I'm stuck halfway to completing my app, the problem is that I have an empty JSON file shown in the following image, I want the user to fill it in and send it to firebase but I haven't found any solutions to do that. Is my thinking the illogical or did I just not find the idea?

Any suggestion or code would be greatly appreciated.

Answer 1

  Object data = {
            "name": name,
            "age": age,
            "gender": gender,
            "phone": phone,
          };

 yourJson[0] =  data;