Cannot upload fields from CSV into Advanced Address

Problem/Motivation

I need to import/upload company submission data contained in a CSV file into my Company Profile webform. All form elements are importing just fine, except for address fields.

Steps to reproduce

1. Add "Advanced Address" element to webform.
2. Create CSV with address field composite values in different columns:
   • company_address__address_line1
   • company_address__locality
   • company_address__administrative_area
   • company_address__country_code
   • company_address__postal_code
3. Go to the Webform Upload page and select CSV file.
4. Attempt to map Source (CSV) columns for address fields to Destination (Submission)
5. No address composite fields are found under Destination

This works if I just use the basic Webform Address element, but I need to use the Advanced Address element (so I can use Webform Content Creator, which does not support the basic Webform Address element).

Proposed resolution

Requesting support for importing CSV fields to Advanced Address fields.