Prometheus Relabeling for Cassandra

Question

I would like to get help with relabeling in prometheus.

I am trying to replace instance with nodename, so here in prometheus before relabeling I would like to have this Nodename

We are using kube-prometheus and we have 5 clusters where is cassandra running in 6 pods.

I want to use this because this dashboard has label with instances dashboard

My attempts to workaround this with * on(pod) group_left(node) kube_pod_info failed, it will duplicate give false number and so I guess the best approach would be to replace the instance with the name or maybe just add another label with the nodename instead of replacing, I have tried a lot of things but this dashboard is just not good fit for multiple clusters and multiple instances of cassandra with same names. Is it possible to use relabeling even when I would not specify the target because the targets are being auto discovered? Or what do you think is the best approach in this case?

Thanks

Edit: In the end I just edited ip address to pod names instead of node names, which eventually was bad idea. Can be closed