Format phone number to add country code

What if you didn’t need to replace numbers in the phone number but add a country code (currently phone numbers have no country code - US’s country code is +1)? Can you give an example of how you would set that up?
The SMS feature won’t work unless the number is specifically formatted with country code, parentheses, and hyphens. Ie +1 (555) 555-5555
I’m not sure how to make that specific format work in the workflows. I have Op Hub Pro.