minecraft-bedrock-json-schemas/source/behavior/blocks/format/events/play_effect.json

{
  "$id": "blockception.minecraft.behavior.block.events.play_effect",
  "type": "object",
  "description": "Spawns a particle effect relative to target position.",
  "title": "Play Effect",
  "additionalProperties": false,
  "properties": {
    "data": { "type": "integer", "default": 0, "description": "Particle data value.", "title": "Data" },
    "effect": { "type": "string", "default": "", "description": "The name of the particle effect to create.", "title": "Effect" },
    "target": { "type": "object", "default": "self", "description": "The target context to execute against.", "title": "Target" }
  }
}