Here's a proof of concept from 2023: https://msglab.co/project/lo-ra-msg

There's others as well, and as this project notes a lot of the underlying code is a mishmash and generally unfinished and buggy.

https://meshtastic.org/docs/introduction/

Meshtastic is another fantastic LoRa network project.

Edit: here's another

https://www.tindie.com/products/bobricius/armachat-meshtastic-compatible-lora-messenger/