actors thumbs missing

Hello, i’m testing Plex for Kodi to (perhaps) replace Plex Media Player.
In PFK there’s a cast section for movies…how to get the proper thumb for every actor?..
There are some screenshots from other users showing it.
Like

i’m using xbmc_for_exported_nfo ---- doesn¡t work
works when using TMDB agent
it’s possible to combine both agents?

thanks