Validate file uploads in block in Twill 3

<x-twill::files name="file" label="Pdf File" :max="1" :translated="true" :required="true" />

@twillBlockValidationRulesForTranslatedFields([
    'file' => 'required|mimes:pdf'
])

{
    "blocks.1063[file][en]": [
        "The file field is required."
    ],
    "blocks.en": [
        "Failed"
    ],
    "blocks.1063[file][fr]": [
        "The file field is required."
    ],
    "blocks.fr": [
        "Failed"
    ]
}