How to setup infrastructure 'Kubernetes' at group level so that my 30 projects can reuse the same?

I’m able to create and use “Kubernetes” under “Infrastructure” in a project. However, I’m not able to do the same to the parent group of my 30 projects. It seems it was possible before with the equivalent feature Group-level Kubernetes clusters (certificate-based) (DEPRECATED) | GitLab

How can I do that or similar? What about Kubernetes Runner, could we get their context too in all the sub projects?