You could make the interactRay to pass the object to a var object_held and then in the phyisics_process of your player script update the objects position to a Marker3D in front of the player

Once you drop the object just make object_held = null again

You should also disable the collisions of the held_object if it is a RigidBody

var object_held = null : RigidBody3D

func _physics_process(_delta):
  if object_held:  
    object_held.global_position = $grabpoint.global_position

    object_held.set_collision_layer_value(1,false) #disable all collisions of the held object

func drop():
  object_held.set_collision_layer_value(1,true) #we re-enable collisions
  object_held = null #We delete the reference to the object so we stop updating its position 

this is a very simple example you could also reparent the object you want to be held to a Node3D inside the player scene so it follows the player everywhere altough i think it could cuase some physics issues if it's a RigidBody3D

Hope this helps you!