You can add this helm repo by helm command
helm repo add observablity https://mohan-nagandlla.github.io/charts/
helm repo update
you can able to get the packages by search command
helm search repo observablity
If you found any desired package then the installing command is
helm show values observablity/[chart name] > valeus.yaml
helm install [release name] observablity/[chart name] -n [namespace] -f values.yaml