French phrase
Je voudrais ~ en option.
Meaning
I would like ___ as an optional extra.
When to use it
A polite way to request an additional service. It is useful when the service is not included by default, especially in hotels and tours.
Example dialogue
Je voudrais le petit déjeuner en option.
I would like breakfast as an optional extra.
Très bien, je l'ajoute pour chaque matin.
Certainly, I'll add it to your booking for every morning.