minecraft-assets/data/minecraft/advancements/recipes/building_blocks/gray_stained_glass.json

{
  "parent": "minecraft:recipes/root",
  "rewards": {
    "recipes": [
      "minecraft:gray_stained_glass"
    ]
  },
  "criteria": {
    "has_glass": {
      "trigger": "minecraft:inventory_changed",
      "conditions": {
        "items": [
          {
            "items": [
              "minecraft:glass"
            ]
          }
        ]
      }
    },
    "has_the_recipe": {
      "trigger": "minecraft:recipe_unlocked",
      "conditions": {
        "recipe": "minecraft:gray_stained_glass"
      }
    }
  },
  "requirements": [
    [
      "has_glass",
      "has_the_recipe"
    ]
  ]
}