Ref Column Dropdown Barcode Search

I would like the ability to search with barcode in the ref column dropdown. Search%20Dropdown

I would like to know that to. I solved it now with a QR. Because then my Key in the source table can be the same as my ref dropdown. The problem is ( i think ) that you can only specify one key. So it is either this dropdown on your image, or the barcode numbers.

I hope someone can help.