Composer 8.1.4 - How use a Voice application and Shadow Variable ?

Hi,

I did not understand how to use the ‘Get Shadow Variables’ in a Input block.

I created an Input block called ‘Get_Value’
I have set Get Shadow Variables → true ( ‘Log block’s Logging Details’ does not show a new variable as written in the manual .. )

I’d like to read user input, as well as in the variable ‘Result Output’, even in Get_Value$ .value
It’s possible ?
What are the Shadows Variable field ? ( for example ‘duration’,‘interpretation’, ecc. ) .
Field ‘value’ is correct ??

Regards