Calling functions on other scripts in Godot

gistfile1.txt

# In your Enemy.gd script

...
const KILL_EFFECT_SCENE = preload(...)

func take_damage(amount: float) -> void:
  enemy_stats.hitpoints -= amount
  if enemy_stats.hitpoints <= 0:
    kill()
    
func kill() -> void:
  queue_free() 
  spawn_effect()

func spawn_effect() -> void:
  var ke = Globals.spawn_instance_on_main(KILL_EFFECT_SCENE)
  ke.set_points_label(enemy_stats.point_value) # IMPORTANT!!!!
  

# Now, in your kill effect scene, add a script on the root node...

extends Particles2D

func _ready() -> void:
  start_countdown()

func set_points_label(points: int) -> void:
  $PointsLabel.text = points
  # can tween the points label so it looks more interesting or do any other effects you want with it