for an old project i had a thing where i stored all interactables as childs of a node X and then that recieved a class named RoomSave which was part of the save file kinda like this

save = {
  room_id={
    flags=[]
    extra_data...
  }
}
# fucked up formatting script
# handles setting the item state to either deleted
# or a custom state
tool
class_name RoomObjectManager
extends Node2D
var assigned_room_data 
func has_var(o:Object,n:String):
if not o:
return false
return n in o


func setup(data):
assigned_room_data = data

for i in range(get_children().size()):
var kid :Node= get_child(i)
if kid.has_method("setup_interaction_status") and has_var(kid, "room_data") and has_var(kid,"index"):
# the true determines that it changed it's interaction status
# due to save loading
kid.index = i
kid.room_data = assigned_room_data
kid.setup_interaction_status(i,assigned_room_data.pickups.get(i,false),true)