Laravel Eloquent: Inverse of Many To Many (Polymorphic)

Question

Example copied from official Laravel Docs:

For example, a Post model and Video model could share a polymorphic relation to a Tag model. Using a many-to-many polymorphic relation in this situation would allow your application to have a single table of unique tags that may be associated with posts or videos. First, let's examine the table structure required to build this relationship:

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

From a tag object I wanted to get all the videos and posts, to which that subjected tag belongs (in case of morphOne an morphMany I can do that by morphTo() method)

Laravel says, I need to define both the videos and posts methods in Tag model in order to define an inverse but I want a relation like taggables which will return the respected parent (whether it's Post or Video)

Reference

I need a similar thing like imageable (but it is polymorphic one to one and I need this kind of thing in many to many)