serve/app/admin/library/crud/stubs/mixins/model/getters/cityNames.stub

    public function get{%field%}Attr($value, $row): string
    {
        if ($row['{%originalFieldName%}'] === '' || $row['{%originalFieldName%}'] === null) return '';
        $cityNames = \think\facade\Db::name('area')->whereIn('id', $row['{%originalFieldName%}'])->column('name');
        return $cityNames ? implode(',', $cityNames) : '';
    }