The GS1 support in the QR code has been added to the Zebra Link-OS printers since the Link-OS v6.6. See the firmware release notes.

6. GS1 type QR barcodes can now be created by specifying the FNC1 code at the beginning of the data.
This is done by using >8 as the first data after the ^FD command.

This article is the closest I've found. Basically, it says there is no way to encode the FNC1 via ZPL, but it's a year or two old, so hoping there might be some updates.

https://stackoverflow.com/questions/70113013/how-to-encode-fnc1-with-zp…

I was hoping to use >8 or _1 but it seems this is not supported in ZPL? There is no mention in the ZPL programming guide. But the firmware release notes seem to indicate something is changing - perhaps it's not documented yet?

Well, I think I've found a workaround. I've been using the Zxing C# for parts of my labelling solution. I've got some working code that produces bitmap images of GS1 QR codes and creates PNG images for web usage. If I take the image bitmap and translate it to the ZPL graphics format and send in the ZPL as an image it should work. Need to add some code to do the ZPL image conversion and should be good to go. It's not network efficient and will create larger files to send to printer, but should work in all my use cases. Not ideal, but it seems that's what most programs are doing as workaround with no direct ZPL code method. Always open to other ideas if y'all have run into this type of thing.

Well got some working code. Here's the ZPL output from the C# program. It creates the bitmap using ZXing (which is GS1) and then I run the bitmap thru a Zpl image translator that generates an image I can put in ZPL code and print. Seems to work great. A little extra processing, but it works and generates the correct symbology Id when printed on a zebra printer.

Here's the sample output:

<code>^XA ^FO0,0^GFA,8000,8000,32, ,:::::::::::::I0G3PFI0GFGCM0IFG0G3GFI0LFI0GFGCH0G3PFK0:::::I0G3GFM0G3GFG0G3HFGCG0IFP0G3GFL0GFGCG0IFG0G3GFM0G3GFK0:::::I0G3GFG0G3JFG0G3GFI0JFGCH0G3GFG0G3GFJ0G3MFG0G3GFJ0G3GFG0G3JFG0G3GFK0:::::I0
G3GFG0G3JFG0G3GFG0G3HFGCG0GFGCK0G3JFG0G3GFG0G3GFL0GFGCH0G3GFG0G3JFG0G3GFK0:::::I0G3GFG0G3JFG0G3GFJ0G3GFG0G3KFGCK0G3JFJ0G3GFJ0G3GFG0G3JFG0G3GFK0:::::I0G3GFM0G3GFG0G3GFG0G3GFI0LFI0GFGCJ0GFGCG0GFGCG0IFG0G3GFM0G3GFK0:::::I0G3PFG0G3GFG0G3GFG0G3GFG0G3GFG0G3GFG0G3GFG0G3GFG0G3GFG
0G3GFG0G3GFG0G3GFG0G3PFK0:::::gG0G3HFGCG0GFGCH0G3GFG0G3JFG0G3GFG0G3GFg0:::::I0G3MFG0G3MFG0G3GFG0G3HFGCH0G3GFG0G3JFG0G3GFG0G3KFGCG0GFGCG0GFGCG0GFGCL0:::::K0IFG0G3GFL0GFGCM0IFI0GFGCG0LFG0G3HFGCM0GFGCO0:::::K0OFJ0G3JFP0G3GFL0GFGCH0G3GFG0G3JFG0G3JFK0:::::I0G3GFJ0G3HFGCG0GFGCG
0JFGCH0G3GFG0G3KFGCG0LFG0G3GFI0GFGCJ0JFGCL0:::::K0IFG0G3JFI0GFGCG0GFGCK0G3GFJ0G3JFG0G3HFGCG0GFGCH0G3GFI0GFGCH0G3GFK0:::::L0G3GFI0GFGCG0JFGCH0G3KFGCM0GFGCG0IFJ0G3HFGCJ0GFGCH0G3GFK0:::::K0JFGCG0OFI0LFI0JFGCJ0GFGCG0IFG0G3JFG0G3GFG0G3GFK0:::::K0IFP0G3GFG0G3HFGCG0GFGCJ0GFGCH0G
3JFG0G3GFI0GFGCJ0GFGCG0GFGCL0:::::I0G3GFJ0G3JFJ0G3GFG0G3GFG0G3HFGCH0G3GFG0G3JFG0G3HFGCG0IFG0G3GFM0G3GFK0:::::K0LFI0IFG0G3GFL0IFG0G3GFG0G3JFM0G3GFG0G3GFI0GFGCG0IFK0:::::L0G3GFJ0G3GFG0G3GFI0IFO0IFL0GFGCG0IFG0G3JFG0G3GFN0:::::I0G3JFP0G3HFGCH0G3GFG0G3JFJ0G3JFG0G3GFI0GFGCJ0GFG
CG0GFGCL0:::::K0GFGCG0GFGCH0G3GFG0G3GFI0GFGCQ0G3HFGCH0G3GFI0LFG0G3GFJ0G3GFK0:::::I0G3HFGCH0G3GFI0GFGCG0IFG0G3KFGCH0G3GFG0G3MFI0GFGCM0GFGCG0IFK0:::::I0G3PFG0G3GFL0JFGCK0G3GFL0GFGCG0IFG0G3JFG0G3GFG0G3GFK0:::::O0G3GFJ0G3HFGCH0G3HFGCG0GFGCH0G3HFGCG0LFG0G3GFI0GFGCJ0GFGCG0GFGCL
0:::::I0G3KFGCG0LFG0G3GFG0G3GFG0G3HFGCS0LFI0GFGCH0G3GFG0G3GFK0:::::I0G3HFGCH0G3HFGCG0IFG0G3GFL0IFL0GFGCG0GFGCH0G3HFGCH0G3GFG0G3HFGCH0G3GFK0:::::I0G3GFG0G3GFJ0G3HFGCJ0IFL0IFG0G3GFL0GFGCG0IFG0G3JFG0G3GFG0G3GFK0:::::I0G3GFJ0G3GFM0G3HFGCH0G3NFGCG0LFG0G3GFI0GFGCJ0GFGCG0GFGCL0:
::::I0G3GFM0G3GFL0GFGCJ0IFJ0G3JFG0G3HFGCG0OFJ0G3GFK0:::::U0G3GFJ0G3MFI0LFG0G3GFJ0G3GFJ0G3HFGCH0G3GFK0:::::I0G3PFG0G3GFL0JFGCK0G3GFL0GFGCH0G3GFG0G3GFG0G3GFG0G3GFG0G3GFK0:::::I0G3GFM0G3GFI0GFGCH0G3HFGCG0MFGCH0G3JFG0G3JFJ0G3HFGCG0IFK0:::::I0G3GFG0G3JFG0G3GFG0G3HFGCH0G3GFG0G3
HFGCM0GFGCH0G3GFG0G3PFI0IFK0:::::I0G3GFG0G3JFG0G3GFG0G3JFP0G3GFI0IFG0G3GFJ0G3GFG0G3GFG0G3HFGCH0G3GFK0:::::I0G3GFG0G3JFG0G3GFG0G3HFGCG0IFI0GFGCK0G3GFL0GFGCG0GFGCG0JFGCH0G3JFK0:::::I0G3GFM0G3GFG0G3KFGCH0G3JFG0G3HFGCH0G3JFG0G3GFJ0G3JFI0IFK0:::::I0G3PFG0G3KFGCJ0IFG0G3GFI0GFGC
M0GFGCG0GFGCK0G3JFK0:::::,:::::::::::::^FS^XZ</code>

Output when scanned:
<code>]Q3019068113117692002306811311769201522072410072422375492598070593MPSAMPLE-LABEL</code>

Perfect for my use. Hope it helps someone else.