minecraft-bedrock-json-schemas/source/behavior/spawn_rules/components/weight.json

{
  "$id": "blockception.minecraft.behavior.spawn_rules.minecraft.weight",
  "additionalProperties": false,
  "type": "object",
  "title": "Weight",
  "description": "This component allows players to set a priority for how often that mob should spawn. Mobs with lower weight values will have a lower chance to spawn than mobs with higher weight values.",
  "properties": {
    "default": {
      "type": "integer",
      "description": "This is the priority of the mob spawning out of 100.",
      "title": "Default",
      "maximum": 100
    },
    "rarity": {
      "type": "integer",
      "description": "UNDOCUMENTED.",
      "$comment": "UNDOCUMENTED.",
      "title": "Rarity"
    }
  }
}