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

{
  "$id": "blockception.minecraft.behavior.spawn_rules.minecraft.density_limit",
  "additionalProperties": false,
  "type": "object",
  "title": "Density Limit",
  "description": "UNDOCUMENTED",
  "$comment": "UNDOCUMENTED",
  "properties": {
    "surface": { "type": "integer", "description": "This is the maximum number of mobs of this type spawnable on the surface", "title": "Surface" },
    "underground": {
      "type": "integer",
      "description": "This is the maximum number of mobs of this type spawnable underground",
      "title": "Underground"
    }
  }
}