Validation rules to check for allowed values

I'm sorry I'm sure something like this is done before, I'm just not sure I've found a clean solution. I want to use validation rules to check for actual allowed values in the request body:

$allowedValues = ['blah1', 'blah2', 'blah3'];

$rules = [
    'type' => `must be any of $allowedValues`
];

Is there a laravely way to do this, or do I need a custom function to loop through the values and return boolean valid or not ?

thanks