This fake bokeh feature uses the depth map attached to the image, which AFAIK only phones do, and uses 'AI' on photos that lack a depth map. Here is a GIF of it in action on a picture using the R5+100-500L.
@AlanF has already posted examples of doing this in Photoshop, but LR is more my speed
@AlanF has already posted examples of doing this in Photoshop, but LR is more my speed