Can I create a select element with telephone country codes?

Hello. In Contact Form 7 I’d like to add a select element that contains a list of all telephone country codes, as in this screenshot. Would Listo be able to assist with that? I see that Listo can be used to create a select element containing all countries. But how would I add the country codes, and the flag images?

There is indeed another plugin that can do this: International Telephone Input for Contact Form 7. But there are a few issues and the developer seems to be MIA.

Thanks in advance.