Laravel - put custom message under message key not in errors after request validation fail

I made CustomRequest and using it in my controller:

someMethod(CustomRequest $request){}

after my validation fail i get this

{message: "The given data was invalid.", errors: {token: ["Token is required"]}}

is it possible to get this:

{message: "custom message only for this CustomRequest fail.", errors: {token: ["Token is required"]}}

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