Laravel’s polymorphic many-to-many association talks about this. This usage scenario is somewhat similar to yours. You can take a look
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Polymorphic Many To Many Relation Table Structure Polymorphic many to many relational database table structure

In addition to general polymorphic associations, many-to-many polymorphic associations can also be used. For example, the Post and Video models of Blog can share the polymorphic Tag association model. First, let’s take a look at the database table structure:

posts

id - integer name - string

videos

id - integer name - string

tags

id - integer name - string

taggables

tag_id - integer taggable_id - integer taggable_type - string

Now, we are ready to set up the model association. Both Post and Video models can establish morphToMany associations via the tags method:

class Post extends Model {

public function tags() { return $this->morphToMany('App\Tag', 'taggable'); }

}
Create a method for each association in the Tag model:

class Tag extends Model {

public function posts() { return $this->morphedByMany('App\Post', 'taggable'); } public function videos() { return $this->morphedByMany('App\Video', 'taggable'); }

}

join? But it is not recommended.

You can also implement a correlation query yourself. Currently, the framework does not provide conditional queries for polymorphic correlations because they are too complex.