It works!
Here is a summary:
- Jabra Enhance Pro 20 hearing aids
- Resound Smart 3D app (version 1.39)
- Apple iPhone mini
- ListenTech Auri transmitter
I would like to thank @Ranson, @RSW, and others for their help. Hopefully the Jabra Enhance app will be updated soon and this would work out of the box for anyone with Jabra HAs.