Filter countries inside phone field

Feature: Add the possibility to filter the countries inside phone field in form feature

Description: Give us some details about your feedback/feature request. Examples, screenshots, videos, etc. are helpful.

I want to filter the list of countries available inside phone field (see attached)

Use-case: Tell us what you are building. How would the feedback/feature improve your experience?

In our use case, we want that only users that have phone inside a selected list of countries can validate a phone using OTP process.