Convert sym to string in app designer

I have a symbol z, a variable x where x = z^2 and Fx = 5/x

I was able to display Fx = 5/z^2 using matlab.

using app designer I want to get the user to input Fx = 5/x

I tried to use edit fields but after taking this input I could only display 5/x and not 5/z^2

Also I want to be able to display the 5/x^2 inside some kind of textbox or label or ay kind of field.