I know a few folks have been using this, good to see this publication DOI.
Chemprop implements the D-MPNN architecture and offers simple, easy, and fast access to machine-learned molecular properties. Compared to its initial version, we present a multitude of new Chemprop functionalities such as the support of multimolecule properties, reactions, atom/bond-level properties, and spectra.
All code is available on GitHub
https://github.com/chemprop/chemprop
And there is a YouTube workshop