Add a prefix to logs/jobs

[DST73]

Is your feature request related to a problem? Please describe.
My problem is, that I have two HA server logging to the same loki docker instance.
My problem is, that I now can’t distinguish from witch HA the messages are coming from.
Is there a way to add a prefix or something that I can use to filter?

Describe the solution you'd like
A way to add a prefix to the log or job or something I can filter for within grafana

Thank you!