Simple numbers in Text Normalization
Hello everyone, 
I'm looking to Text Normalization, Inverse Text Normalization to be more specific, and I saw something "weird".
For simples numbers, like "Um" (equivalent "one") returns "Um" instead "1", should  this be normal?
The ITN normalize with some prefix or suffix, or can inverse normalize numbers in general?

![image](https://user-images.githubusercontent.com/94904861/191030298-0ac5053a-f6fa-4283-8b2a-99e1329c9fe1.png)

