Hello Matteo:
I found another client (I am pretty sure you did as well) called “python-loki-client” but I am not sure how useful it might be, according to this paragrah in the page:
“WARNING: This is a beta release of the loki-client, the client is incomplete”
My workaround for the time being: I am using Grafana´s HTTP API to get records from Loki. It is a little bit cumbersome but I get the requested information anyway. I just have have to sweat a bit to dig into the result to get the actual payload I am interested in.