Multiple array validation in laravel

I have 3 type of data to validate

1. data in group
2. single data
3. single and data in group combined

This validation works for single data

$validator = Validator::make($request->all(), [
    'tests.*.finding' => 'required',//works for single test
]);

Data sample for above

["tests"=>
                [
                    0 => ["finding"=>""]
                ],
                [
                    1 => ["finding"=>""]
                ]
            ]

And this validation works for data in group

$validator = Validator::make($request->all(), [
    'tests.*.*.finding' => 'required',//works for group
]);

Data sample for above

  ["tests"=>
                    [
                        "A" =>[
                            [
                                0 => ["finding"=>""]
                            ],
                            [
                                1 => ["finding"=>""]
                            ]
                        ],
                        "B" =>[
                            [
                                0 => ["finding"=>""]
                            ],
                            [
                                1 => ["finding"=>""]
                            ]
                        ]
                    ]
                ]

How to validate for single and data in group combined

Combined Data sample

 ["tests"=>
                    [
                        "A" =>[
                            [
                                0 => ["finding"=>""]
                            ],
                            [
                                1 => ["finding"=>""]
                            ]
                        ]
                    ],
                    [
                        0 => ["finding"=>""]
                    ],
                    [
                        1 => ["finding"=>""]
                    ]
                ]

Please help me to fix this, as 1st scenario always gives error for scenario second and vice versa.

via Niklesh