Adding a simpler way to bind reactives when dynamically mounting new widgets

[AliJavidiCS]

Hi. This is a simple request to add simpler way to use data_bind on dynamically mounted widgets. Take a look at the sample code below please.

from textual.app import App, ComposeResult
from textual.widgets import Label
from textual.reactive import reactive
from textual.widget import Widget


class L3(Widget):
    animal_sound = reactive("Meow")

    def compose(self) -> ComposeResult:
        yield Label(self.animal_sound*3)


class L2(Widget):
    animal_sound = reactive("Woof")

    def compose(self) -> ComposeResult:
        yield Label(self.animal_sound*2)
        yield L3()

    def on_focus(self, event: Focus):
        new_L3 = L3()
        new_L3.animal_sound = "Hmmm"
        
        # How Can I bind L3's animal_sound to MainApp's animal sound directly?
        new_L3.data_bind(self.parent.animal_sound) # Would be so great if we could use objects to bind reactives instead of classes
        self.mount(new_L3)


class MainApp(App):
    animal_sound = reactive("Woof")

    def compose(self) -> ComposeResult:
        yield Label("Sorry if this question is dumb")
        yield L2()


MainApp().run()

Thanks in advance!