Twill

Hello!

Is it possible to write validation rules for a specific crop of a `medias` form field?

my usecase would be validating that a block-editor block with a medias form field, has at least X amount of images attached in a single `medias` form field

Something along the lines of this:
```php
@twillBlockValidationRules([
    'medias.cover' => [
        'required',
        'min:12'
    ],
])
```

EDIT:
Nevermind I figured out how to target the medias.cover properly. Ended up using this:
```php
@twillBlockValidationRules([
    'cover' => [
        'required',
        'array',
        'between:12,16'
    ],
])
```
where the medias form field name is `cover`