How do I export blackboard properties from BTAction?

[Shadowblitz16]

class_name InputPressed extends BTAction

@export var id    : ???
@export var input : ???


func _tick(delta: float) -> Status:
	var id     :int   = ???
	var key    :String= ???
	var action :="player"+str(id)+"-"+key
	
	if not InputMap.has_action(action):
		return Status.FAILURE
	
	if Input.is_action_pressed(action):
		return Status.SUCCESS
	return Status.FAILURE