How to find whether a bar code of type QR code already exists in the SAP system?

Hello,

I have a requirement to print a bar code of type QR code in Smartform. I would like to search if a Z/standard bar code of this type is already created in the system so that I can reuse it in my smartform.

Could you please advise how do I search for an already existing bar code of type QR code?

Thank you,