What versions of Dorico include notation from chords?

Or is it only the Dorico Pro?

The generating notes from chords feature first appeared in Dorico 4.3.

It is a Pro-only feature: compare the help page on the feature from the Dorico Pro 4 manual with the Arranging tools section of the Dorico Elements 4 manual, which doesn’t have a “Generating notes from chords” section.