Is t possible to set up a second barcode field on items that works with the app?

Our system is set up to use the SKU field for an internal identifier. This field is synchronised with various  external ecommerce platforms for stock tracking so we don't want to change this.

We do want to start using the mobile app more and see we can scan a barcode to search inventory and t add an SKU.

As we don't want  to change the SKU can we add a second barcode field we can update by scanning with the mobile app and use to search inventory?

I have set up a plain number field - but we cannot use the scan function on the app to update it.