FW: symfony 4.2

When trying to create an empty object the api:swagger:export transform empty objects into empty arrays.
I need that a specific resource doesn't use the swagger api_keys, instead, I want to use nothing as security.

Yaml:

...
consumes:
   - application/json
produces:
   - application/json
security: [ { } ]

Them I run ./bin/console api:swagger:export

Actual:

"security": [
                    []
                ],

Expected:

"security": [
                    {

                    }
                ],

Thanks.