Eloquent GroupBy Pagination?

I'm dealing with an app that has some data I need to sort into groups based on the day they were created, and then be paginated for view on a webpage.

I've gotten the basics working;

$result = Model::query()->oldest()->get()->groupBy(function ($model) {
        return $model->created_at->format('j-M-Y');
});

I've scowered the web for an answer to this, and every single answer I find links the same thing, this message from the Laravel docs;

Currently, pagination operations that use a groupBy statement cannot be executed efficiently by Laravel. If you need to use a groupBy with a paginated result set, it is recommended that you query the database and create a paginator manually.

However, this has since been removed from the Laravel Docs but no real explanation or example has really been given about how to use groupBy with pagination from what I've seen.

I was hoping someone might explain this to me? I want to avoid using any sort of RAW SQL if possible, and keep it as much eloquent as possible.

Eg example of desired output

[
    '25-Apr-2022' => [
        Model,
        ...
    ],
    '26-Apr-2022' => [
        Model,
        ...
    ],
    '27-Apr-2022' => [
        Model,
        ...
    ],
    etc...
]