How to print the status of internal and external battery separately?

I have a thinkpad T570 with an internal an external battery. What do I need to put into my i3status.conf to include each battery separately in my i3status as well as the combined percentage.

Start with the battery-related configuration in i3status.conf and determine whether it supports separate internal and external battery values alongside a combined percentage. Done means documenting the required configuration, or clearly recording the limitation if the requested status cannot be configured.

Written by the indexing model from the issue text.