Gravity forms List field searchable dropdown menu in Wordpress

I’m trying to make my list field as a dropdown to be searchable, as I have over 500 entries populated from the database.

But unlike normal dropdown, I cant just check the enhanced UI and have it work.

I tried to use Jquery along with Select2 and Chosen libraries but with no success. I even tried to use jQuery-Autocomplete , bit it doesn’t seem to work.

I’m using code snippet plug-in to add any functions.php code, and that’s where I have tried to put the Jquery code snippets.