Context doesn't allow access to nested data

What steps will reproduce the problem?

public function getRules(): array
{
    return [
        'submitForVerification' => [
            new Required,
            new BooleanValue,
        ],
        'tasks' => [
            new Each(
                new Nested([
                    'push' => [
                        new Nested([
                            'isEnabled' => [
                                new Required(when: fn() => $this->submitForVerification),
                                new BooleanValue,
                            ],
                            'content' => [
                                new Required(when: [???]),
                            ],
                        ])
                    ],
                ])
            )
        ],
    ];
}

What is the expected result?

I can set Required validator for content dependent on his sibling isEnabled value.

What do you get instead?

It cannot be done? Or it'll be ugly solution.

Additional info

Use the PHP reproduction as the starting point and inspect how Nested, Each, and Required pass validation context. Determine how a Required condition can access the sibling isEnabled value inside each task's nested push data; done means the supplied rule can conditionally require content and the behavior is demonstrated with a regression case.