Issues trying to access dynamic widget properties in ScreenManager

[Ed_S]

My code snippet below contains a one test input template that gets called in every screen. Every screen test should have a button with a on_press event corresponding to the test itself --  which are all different.
Since the input field is the same, i would like to call it dynamically like i started here but i don’t know how to exactly change the on-press event on the test itself.
Any help or ideas would help on getting the dynamic on_press events to work. NB: I have 6 tests each calling a unique funtion, the testing layout is same.

<Tests@FloatLayout>
    Button:
    TextInput:
    Button:
        on_press: root.call_some_test_function()

<MyScreenManager@ScreenManager>:
    id:sm

    Screen:
        name: 'Test1'

        Tests:
            on_press: #call function corresponding to test 1
            size_hint_y: 0.5

        Button:
            text: 'Go Home'
            on_release:root.current = 'Home'

    Screen:
        name: 'Test2'

        Tests:
            on_press: #call function corresponding to test 2
            size_hint_y: 0.5