@minecraft/creator-tools/data/content/newitemjson/block_behavior.json

Minecraft Creator Tools command line and libraries.

{
  "format_version": "1.21.80",
  "minecraft:block": {
    "description": {
      "identifier": "examplens:examplename"
    },
    "components": {
      "minecraft:geometry": {
        "identifier": "minecraft:geometry.full_block"
      }
    }
  }
}