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"an optional extra" is correct and usable in written English.
You can use it when you are talking about something that people can choose to have or do in addition to something else, although it is not required. For example: "The deluxe car was sold with leather seats, a sunroof, and air conditioning as an optional extra."
Exact(60)
Room service is an optional extra.
Stability is not an optional extra.
Everything else is an optional extra.
Transparency cannot be an optional extra.
Periods are not an "optional extra".
On others it is an optional extra.
On others, it is an optional extra.
That said, humour's not an optional extra for her.
A further 3% provided cover as an optional extra.
Fairy dust, presumably, comes as an optional extra.
Featherstone is an optional extra, but Fox is not.
More suggestions(3)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com