Specific labels for web errors

Hello folks,
I try to do my first grafana (v5.4.5) dashboard and I’ve been struggling with labels. Here’s the graph :

What I’d like to have is something like this:
200: TECHNICAL ERROR 210: FOLDER FULL
301: SIEVE FULL
330: UNVALID CREDENTIALS
And so on and so fourth.

Is it possible to do so ? If yes, where can I find the way to do so.

Thanks a lot