customize table name polymorphic many-to-many relationship in Laravel?

Question

Trying to implement a polymorphic many-to-many relationship, similar to the one in the documentation.

In my case, for label instead of tag. And using different table names

apples / oranges / ...
  id - integer
  name - string

label_types
  id - integer
  name - string

labels
  label_type_id - integer -- foreign ID for LabelType
  labeling_type - string
  labeling_id - integer - ID of the model this labelType is used for


// Apple / Orange / ...

    public function labels(LabelType $type = null)
    {
        // need to provide table name, as expected default table name is labelings
        return $this->morphToMany(Label::class, 'labeling', 'labels');
    }

// Label

    public function apples()
    {
        return $this->morphedByMany(Apple::class, 'labeling', 'labels');
    }

    public function oranges()
    {
        return $this->morphedByMany(Orange::class, 'labeling', 'labels');
    }

This results in an error.

$apple->labels;

Illuminate\Database\QueryException with message 'SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'labels' 

select
  `labels`.*,
  `labels`.`label_id` as `pivot_label_id`,
  `labels`.`label_type` as `pivot_label_type`
from
  `labels`
  inner join `labels` on `labels`.`id` = `labels`.`label_id`
where
  `labels`.`label_id` = 1
  and `labels`.`label_type` = 'App\Models\Apple'

In the example above I have added the table name to morphToMany().
Same error when using labelings as table name and adding to Label model: protected $table = 'labelings';

How do I get this to work? I do want to use label_types as it better fits with the rest of my application.
I looked at other polymorphic questions on Stackoverflow, but could not find an answer.