How to set labels for managed local Prometheus/node_exporter?

Hello there :wave:,
We have self-hosted Gitlab package installed from a Debian package and we would like to know how to properly configure Gitlab (if possible) to set custom labels for local managed node_exporter activated via Node exporter | GitLab.

Currently, the metrics have label instance="localhost:9090", which is ugly :roll_eyes:.
I know, that I can set custom labels within prometheus['scrape_configs'], but this is only for addtional scrape jobs :slightly_frowning_face:.

Is there any way how we can achieve to have something like instance="grafana"?