How do I receive a variable or function within the Textformfield input without having to type and save to the list with Flutter?

Question

I need to insert a text inside the input so there is no need for typing, it was a way to edit the data stored in Firebase, when I edit the data, goes to an editing screen with the data in each input, for the user to edit or not, as you see fit. I’m not able to do this, always requires me to type some character, tried functions, variables, various forms and none succeeded. If anyone can give a different idea or a solution, I’d be grateful.

I declared a control for the name, that way:

TextEditingController _controleNome = new TextEditingController();

In addition to inserting it into the initState:

void initState(){
    super.initState();
    _controleNome.text = 'Teste';
}

                              Container(
                                width: 330,
                                height: 50,
                                  child: TextFormField(
                                  autofocus: true,
                                  cursorColor: Colors.brown,
                                  style: TextStyle(fontSize: 16.0, height: 1.5, color: Colors.brown),
                                  textAlign: TextAlign.left,
                                  controller: _controleNome,
                                  decoration: InputDecoration(
                                    labelText: 'Nome',
                                    labelStyle: TextStyle(color: Colors.brown, fontSize: 16.0, fontWeight: FontWeight.w700),
                                    isDense: true,
                                    contentPadding: EdgeInsets.all(2.0),
                                  ),
                                  onChanged: (text){
                                    editado = true;
                                    setState(() {
                                      _editaContato.nome = text;
                                    });
                                  },
                                ),
                              ),