How to access the current data in edit page?

How can i get the current state of a data in edit page to be manipulated using mutateFormDataBeforeFill, i saw the below code on documentation but instead of auth()->id() i want to query data
protected function mutateFormDataBeforeFill(array $data): array
{
    $data['user_id'] = auth()->id();
 
    return $data;
}
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