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https://www.grammarly.com/blog/diaeresis/ Could have googled that first I guess...

Yes and no. It's not strictly speaking correct but in French a diaeresis above a vowel means it's separate from the preceding one. Think about the car maker Citroën, "Sit-roh-en" rather than "Sit-rohn".

So if you squint a bit it describes the noise the word makes accurately but it's not how you'd write it in English.

I think the only English words where it is widely used are Noël and naïve (which obviously come from French).

They've discussed this: https://www.newyorker.com/culture/culture-desk/the-curse-of-...