hi, @martinavalogia you can recognize numbers by using entity extraction and regular expression concepts you have to define related examples in your NLU.md file and extract numbers as entity for precise extraction you can use regex.
Example
intent: employee
- my employee code is AC7200
regex:emp_code
[A-Z]{2}[\d]{4}
in some cases like phone number, and numerals extraction Duckling is a good choice