Laravel Mutator in query builder? - development

Laravel Mutator in query builder?

I’ve no idea how to define two field as one field using mutator in query builder
here’s my code

$model = LoanInformation::select( 
                'basic_information.first_name', 'basic_information.last_name',
                'loan_information.id', 'loan_information.tenor'
            )->join(
                'basic_information', 'loan_information.user_id', '=', 'basic_information.user_id'
            )->where(
                'loan_information.status', 'funding'
            )->paginate(9);

How can I make first_name and last_name define as name and add statement on it which return strtoupper(first_name) and strtoupper(last_name)

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