How to use something else than "find" in the @can directive when looking for a specific model instance?

Question

I have this policy file used for SomeModel

class SomeModelPolicy{
 ... 
 public function delete($user, SomeModel $someModel){
   return $user->can('update', $someModel->someOtherBelongsToModel)
 }
}

and want to use a @can directive in order to specify who should be able to delete a model via a graph ql query.

Normally, i would write something like this

@can(ability: "delete" find:id model:"App\\Models\\SomeModel")

but this specific graphql query is not selecting by id (which is primary key) but by other key called public_id.

Now, i've read in the documentation that i should use something like

@can(ability: "delete" query:true model:"App\\Models\\SomeModel")

in combination with "directives that add constraints to the query builder, such as @eq", as the docs specify, but i can make literally nothing work with the query i've tried

@eq(key: "public_id" value:public_id)

or

@where(key:"public_id" operator:"=")

but graphql just always throws error saying

`Too few arguments to function App\\Policies\\SomeModelPolicy::delete(), 1 passed `

I have been pulling my hair for hours. The docs are really unhelpful, there are almost no examples online and the Lighthouse's error message is not helpful at all, providing a vague message with an irrelevant stack trace.