"If I may" is an appropriate and commonly used expression in written English.
It is often used to introduce a request or suggestion in a polite manner. Example: If I may, I'd like to suggest that we begin our presentation with the most recent data.
Exact(59)
If I may quote: "Professor A.
If I may… never mind.
If I may, Justice Brandeis -- JUSTICE SCALIA.
If I may say so — Oy!
"If I may!" Muratov stretched out his hand.
"If I may say so," declared Mr Harper, crossly.
If I may quote Gob Bluth: Oh COME ON!
If I may add to that: nothing can avoid changing.
If I may say so, journalists can never resist guerrillas".
If I may, if I may just make little bit of progress.
If I may just add something else? MiSciNet: Please do.
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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