Creating a form to populate a database in Kivy

The end goal is to create entries in a database with info from a form, using a variety of widgets (textinput, checkboxes,etc). I wanted to make a button at the end of the form to submit the responses to a dict, but I am getting stuck. The only way I can think of to accomplish this is to make all the ids to object properties, then individually reference them in a function like series1.value... series2.value...

This seems very cumbersome and would make it difficult to add further entries to the form later on.

Here is my .py:

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.checkbox import CheckBox
from kivy.uix.togglebutton import ToggleButton
from kivy.uix.button import Button


class DermRoot(BoxLayout):
    dict_filled_from_form = {}
    def add_entry_to_db(self,dict_filled_from_form):
        pass

class DemographForm(BoxLayout):
    sex = ObjectProperty()
    age_input = ObjectProperty()

    def add_entry(self,dict_of_form):
        dict_filled_from_form = dict_of_form
        #is this possible?
        #or do I have to do dict_filled_from_form['series1'] = series1.value etc

class DermApp(App):
    pass

if __name__ == '__main__':
    DermApp().run()

and my kv file

DermRoot:

<DermRoot>:
    DemographForm

<DemographForm>:
    orientation: "vertical"

    GridLayout:
        age_input: age_input
        sex: sex

        cols: 2
        Label:
            text: "Patient's Age:"
        TextInput:
            id: age_input
            focus: series4
            multiline: False
        Label:
            text: "Sex:"
        ToggleButton:
            id: sex 
            text: "Male" if self.state == 'normal' else "Female"
        Label:
            text: "Standard Series to Include?"
        GridLayout:
            series1: series1
            series2: series2
            series3: series3 
            series4: series4
            series5: series5

            cols: 2
            CheckBox:
                id: series1
            Label:
                text: "Series1"
            CheckBox:
                id: series2
            Label:
                text: "Series2"
            CheckBox:
                id: series3
            Label:
                text: "series"
            CheckBox:
                id: series4
            Label:
                text: "series4"
            CheckBox:
                id: series5
            Label:
                text: "Series 5"
    Button:
        height: "40dp"
        size_hint_y: None
        text: "Add Entry to Database"
        on_press: root.add_entry(dict_of_form = 'how do I get this?')