Fabric 1.20.1

Hello!
I'm wondering if anyone can help me figure out how to write custom trades for vanity designs with VillagersPlus mod.
The nbt for vanity design from Gumillea Twilight Zone reads {Design: {Id: "vanity_twilight_zone:polar_night"}}
I've tried a few things: adding an entry for design and id with the design name but only the empty design sheet shows up in trades.

"sell": {
    "item": "vanity:design",
    "count": 1,
    "id": "vanity_twilight_zone:polar_night"
},

latest attempt:

Appreciate any help!
🙏🙏🙏