I personally use ACF to add new profile fields into the main wordpress profile section so that I can easily get and set the meta/field key information. With that information, I can then display the data where necessary whether in an email or on the site.
However, I know you are trying to do it specifically from the Extended Profile. I have been trying to figure that out for quite some time now. It may be more complicated than a simple token call. I would love to know the answer to this myself!
