Texts exceed a Label or Textbox

MIT App Inventor Help
1

Hi Community,
I am creating a simple calculator app, i want to make the numbers appear from right to left in a Label or TextBox, and the numbers automatically scroll to left continueously when they fully filled and exceed the Label. As a result i can see the last number without scrolling the Label or Textbox.
How should i set the block? Here is my example :
Thanks anyone can help !
P1

P2
P2802×330 89 KB

2

Right align the label ?

3

Thank You,
In fact, i want the result like that :

4

grafik

5

Thanks Anke,
I can do the result with your method by using mobile's keyboard, but i can't do it with my number button pad I created on my calculator.
Is there any method?
Thanks!
NumberButtons