pumpkin-java-multiversion/assets/datapacks/26_1/data/minecraft/painting_variant/changing.json

{
  "width": 4,
  "height": 2,
  "asset_id": "minecraft:changing",
  "title": {
    "translate": "painting.minecraft.changing.title",
    "color": "yellow"
  },
  "author": {
    "translate": "painting.minecraft.changing.author",
    "color": "gray"
  }
}