Distant relationship with Laravel 5.5

Well, I need some urgent help!

I have the following situation:

Tables:

saidas
   id
   ...

saidas_produto
   id_saida
   id_entrada_produto

entradas_produtos
   id
   id_entrada
   id_produto
   ...

entradas
  id
  ...

My warehouse system works with incoming and outgoing multiple products. Where an output is made to an item that was added to the input (input_products) - > here is where the items (products) of the entry are stored. In other words, an output is not directly related to a product, but to a product that has been entered.

I was able to make the right relationship to the entry:

public function produtos() {
    return $this->belongsToMany('Estoque\Produto', 'entradas_produtos', 'id_entrada', 'id_produto')->withPivot('id', 'numero_lote', 'vencimento_lote', 'quantidade', 'valor_unitario')->orderBy('entradas_produtos.id', 'asc');
}

How do I make this relationship by going through the outputs_products table, picking up my product that is inside inputs_products and picking up the name of the product that is inside products?

I have tried everything and nothing: (