How to include the search option in the "country code" attribute for the telephone fields

Summary:

Include the search option in the "country code" attribute for the telephone fields

Content (required):

We want to include the search option for the country code attribute of the phone field

For example, something similar to those with other fields:

how to achieve that?

Version (include the version you are using, if applicable):

23A

Code Snippet (add any code snippets that support your topic, if applicable):