As of E-Learning Lab 1.4.2 you can now add NPC agents to your scene. To do this, simply drag and drop or use the built in avatars in the "Avatars" tab of the assets browser.
Additionally, as of E-Learning Lab 1.4.11 you can also now generate fully rigged avatars from a photo or text prompt using Meshy or Tripo (requires API key). Otherwise can add from any avatar library source that is .fbx, .glb or .glTF
Drag and drop from Avatars asset library to Inspector and place in your scene
Can then choose which animation state to play (view available states in Inspector under the "Animations" tab), and right click to set Facial morphs.