Prepopulate dynamically selected values of a Chosen dropdown

I want to automatically select values in a Chosen dropdown but can't manage to do it.

Here the code I use :

add_filter(gform_field_value_chosenbox, create_function('', "return '{$inherited_value}';"));

with :

print_r($inherited_value);

returning :

Array ( [0] => Item1 [1] => Item4 )

Just to mention that these values (Item1 and Item4) are configured the same way in the form (Label and Values are the same).

Thank you for your cooperation !