Google does offer Translation API, text to speech API, but is there a transliteration API that shows the pronunciation in Romanian text, like what they did in Google Translate?
For example, the pronunciation of hello is heˈlō,həˈlō, it might differ for different languages.
It seems you're looking for Transliterate API but it has been deprecated long ago unfortunately. You can still use it though, but please read the deprecation policy first.