GS1-128 barcode format in Apple Wallet Pass

I need to create a GS1-128 barcode in my pass. The barcode-element in my pass.json looks like:


"barcodes":[{"message":"8018131041711111111111","format":"PKBarcodeFormatCode128","messageEncoding":"iso-8859-1"}],


With this I am able to generate a Code128 barcode. How can I integrate the FNC1 to receive a GS1-128 barcode?


Any help would be greatly appreciated.

GS1-128 barcode format in Apple Wallet Pass
 
 
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