How to choose articles using Transcript?

I’ve learned about Localization/Concepts/Transcript - KDE TechBase, which seems a really cool way to avoid common translation quirks.

Specifically, I’m trying to choose the article based on the first letter of the word to avoid doing a(z) in Hungarian.
If the first letter is a consonant it should choose the word a, if it’s a vowel it should choose the word az.
a NeoChat, a Dolphin but az Ark, Az Arianna, az Okular

I’m not technical enough to solve it myself from the docs. Is this even possible?