how to setup custom crafting for prefabs

i wanted to add bushes and trees and other different vegetation prefabs in craft menu so players could decorate there bases, but im not sure how to set it up

i tried copying stuff from the entities.json from place anything

"Birch Tree Small": {
    "BaseItem": "clone.hemp",
    "SkinID": 2685224593,
    "Prefab": "assets/bundled/prefabs/autospawn/resource/v3_temp_forestside/birch_small_temp.prefab",
    "NeedsTCAuth": true,
    "CanBePickedUp": false,
    "AdjustHeight": 0.0

craft menu 

"birch_small_temp.prefab": {
    "Name": "birch_small_temp.prefab",
    "Image": "",
    "SkinID": 2685224593,
    "Category": "dlc",
    "Tier": 1,
    "ResearchCost": 0,
    "Resources": {
      "wood": 1

also im not sure what image to use

greetings Alpha from germany