Cluster Global images and networks resources

1. How to share a single image across all the projects/namespaces in OpenShift cluster?
2. How to share a single additional network (created through multus network-attachment-definition resource) with all the projects/namespaces in OpenShift cluster?

I am aware of per project isolation on these resources and the way to grant access in one project to use resources in another project/namespace.
However, my usecase requires to these resources to be available in all the projects by default without the need to assign the permissions explicitly and per project basis.

Basically, I want to have a network and image as global resource in OpenShift cluster. How to achieve this?