How to create a painting?

I'm making a mod and i want to add a painting to the game, which i recon is made like in datapack? Version 1.21.4, namespace - silly_rat_mod 
data/minecraft/tags/painting_variant/placeable.json
  "values": [
    "silly_rat_mod:your_money"
  ]
}```

data/silly_rat_mod/painting_variant/your_money.json
```{
  "asset_id": "silly_rat_mod:your_money",
  "height": 2,
  "width": 1,
  "title": {
    "translate": "painting.silly_rat_mod.your_money.title"
  },
  "author": {
    "translate": "painting.silly_rat_mod.your_money.author"
  }
}```

assets/silly_rat_mod/painting/your_money.png
height x width = 256x128