Kivy RecycleView custom labels

I'm creating an app with five screens.

• On four screens the user can save different kind of data (number, string, list) to an sqlite3 database.
• The fifth screen is the "History Screen" where the user can fetch the desired number of last elements from the database.

DB structure:

On the History Screen I use RecycleView. It works but I want to improve it a bit. Unfortunately I'm stuck.

RecycleView now:

What I want to achive: to create a custom label for DataInput, Date, Result1, Result2 (and maybe a divider between the list name and the last number)

What I've tried so far: create a custom viewclass. The problem here is that I don't know how to populate the custom labels and achive the same result as you see in the picture above but with custom labels. I found similar questions here on stackoverflow but I still can't figure it out how to solve it.

Viewclass example:

<CustomView@BoxLayout>:    value_listname: ""    value_date: ""    value_result1: ""    value_result2: ""    BoxLayout:        orientation: "vertical"        Label:            text: root.value_listname            color: 1, 1, 0, 1            font_size: "13sp"        Label:            text: root.value_date            color: 1, 0, 1, 1        Label:            text: root.value_result1        Label:            text: root.value_result2        #Divider after the last number

Example code:

from kivy.app import Appfrom kivy.lang import Builderimport sqlite3import randomimport datetimefrom kivy.uix.screenmanager import ScreenManager, Screen, NoTransitionfrom kivy.properties import ObjectProperty, ListPropertyBuilder.load_string("""<CustomView@BoxLayout>:    value_listname: ""    value_date: ""    value_result1: ""    value_result2: ""    BoxLayout:        orientation: "vertical"        Label:            text: root.value_listname            color: 1, 1, 0, 1            font_size: "13sp"        Label:            text: root.value_date            color: 1, 0, 1, 1        Label:            text: root.value_result1        Label:            text: root.value_result2        #Divider after the last element<DataInputScreen>:    number_1: number_1    number_2: number_2    result: result    BoxLayout:        orientation: "vertical"        TextInput:            id: number_1            hint_text: "from... (int)"            halign: "center"            font_size: "50dp"            size_hint: 1, 0.5        TextInput:            id: number_2            hint_text: "...to (int)"            halign: "center"            font_size: "50dp"            size_hint: 1, 0.5        Label:            id: result            font_size: "50dp"        Button:            text: "Show the number and save it to DB"            on_release:                root.random_choice()        Button:            text: "Go to 'History' screen"            on_release:                app.root.current = "historyscreen"<HistoryScreen>:    record_text: record_text                BoxLayout:        orientation: "vertical"        TextInput:            id: record_text            hint_text: "Show the last 'n' record(s)"            halign: "center"            font_size: "50dp"            size_hint: 1, 0.2               Button:            text: "Show the records from DB"            size_hint: 1, 0.2            on_release:                root.show_records()        Button:            text: "Back to 'DataInput' screen"            size_hint: 1, 0.2            on_release:                app.root.current = "datainput"            BoxLayout:            size_hint: 1, 0.600            pos_hint: {"center_x": 0.500, "center_y": 0.350}            RecycleView:                id: rv                viewclass: "Label"                #viewclass: "CustomView"                RecycleBoxLayout:                    default_size: None, dp(30)                    default_size_hint: 1, None                    size_hint_y: None                    height: self.minimum_height                    orientation: 'vertical'"""                    )class DataInputScreen(Screen):    number_1 = ObjectProperty()    number_2 = ObjectProperty()    result = ObjectProperty()    def random_choice(self):        first_number = int(self.number_1.text)        second_number = int(self.number_2.text)        if first_number > second_number:            first_number, second_number = second_number, first_number        x = random.randint(first_number, second_number)        self.result.text = str(x)        conn = sqlite3.connect("results.db")        c = conn.cursor()        c.execute("INSERT INTO numbers VALUES (:ListName, :Date, :Result1, :Result2)",                  {"ListName": "DataInput","Date": datetime.datetime.now(),"Result1": self.result.text,"Result2": None})        conn.commit()        conn.close()class HistoryScreen(Screen):    record_text = ObjectProperty()    data_items = ListProperty([])    def show_records(self):        self.data_items = ""        conn = sqlite3.connect("results.db")        c = conn.cursor()        c.execute("SELECT Date, ListName, Result1, Result2 FROM numbers LIMIT ?", (self.record_text.text,))        records = c.fetchall()        conn.commit()        conn.close()        for record in filter(None, records):            for col in filter(None, record):                self.data_items.append(col)        self.ids.rv.data = [{'text': str(x)} for x in self.data_items]class myApp(App):    def build(self):        sm = ScreenManager(transition=NoTransition())        sm.add_widget(DataInputScreen(name="datainput"))        sm.add_widget(HistoryScreen(name="historyscreen"))"""Create Database"""        conn = sqlite3.connect("results.db")        c = conn.cursor()        c.execute("""CREATE TABLE if not exists numbers(        Date text,        ListName text,               Result1 text,                   Result2 text        )""")        conn.commit()        conn.close()        return smmyApp().run()

Could you help me?