I just double-checked an example card, and it does look like the member is appearing. Here is some sample code that shows it: Edit fiddle - JSFiddle - Code Playground
If you can’t get it to appear, do you have a code example you can share?
The example does work and it led me to the issue: The API call requires the members=true parameter in the query, which I did not have. I haven’t looked at the docs for this particular request for some time and I assumed that when I specify fields=all, I get all the fields needed and it was not the case.