Phone prefix from int-tel-input won't show in Webflow Logic

Hi all,
I am working on a client’s website with a form calling their API with Logic and the form has a phone with a prefix. I have added the phone prefix with this javascript plugin -

But even though the prefix is a normal input field, it is not appearing in the Logic flow and I can’t add it to the Body of the HTTP request, which is really strange.

Can anyone help me out with this? I am providing the read-only link below:

https://preview.webflow.com/preview/ultralytics?utm_medium=preview_link&utm_source=designer&utm_content=ultralytics&preview=354e85550ad74241c2b57115dcc36e12&pageId=65252e1395fb1f82cf4de0d6&workflow=preview

Thanks in advance!