Generic custom error response in Dingo API - lumen

Question

I am trying to abstract all my error responses to match my API documentation for developing a good, pragmatic API using Lumen and the Dingo API package:
A JSON error body should provide a few things for the developer - a useful error message, a unique error code (that can be looked up for more details in the docs) and possibly a detailed description. JSON output representation for something like this would look like:
{
"code" : 1234,
"message" : "Something bad happened :(",
"description" : "More details about the error here"
}
At the moment, the Dingo API only provides me with the following response:
{
"message": "Could not create new user.",
"status_code": 422
}
1. How can I add extra fields to all error responses, e.g "description" and "code"
The configuration page shows a possible error format to set on your bootstrap/app.php file but I'm wondering how I can add possible new tags and use these.
I know it's possible using a custom exception and returning a new response:
app('Dingo\Api\Exception\Handler')->register(function (\App\Exceptions\ValidationException $exception) {
return Response::make(['code' => $exception->getCode(), 'message' => $exception->getMessage()], 401);
});
I want to know if this is the best practice to do it like this but on all exceptions (including the default ones of Dingo/Symfony), for example using the configuration parameters: ->setErrorFormat([]);
2. Change validation errors format
Validation errors for PUT, PATCH and POST requests will need a field breakdown. This is best modeled by using a fixed top-level error code for validation failures and providing the detailed errors in an additional errors field, like so:
{
"code" : 1024,
"message" : "Validation Failed",
"errors" : [
{
"code" : 5432,
"field" : "first_name",
"message" : "First name cannot have fancy characters"
},
{
"code" : 5622,
"field" : "password",
"message" : "Password cannot be blank"
}
]
}
Currently, Dingo API provides me the JSON in the following format:
{
"message": "Could not create new user.",
"status_code": 422,
"errors": {
"username": [
"The username field is required."
],
"password": [
"The password field is required."
]
}
}