Installing program on main hub only

I have setup kubernetes/jupyterhub following the guide and it seems to be working great (thanks!!!)

I am just wondering if I can install a program (specifically a lightweight bitcoin node) on the “master” pod/hub only, i.e. not on every user pod, which then all the users could easily connect to from within the LAN?

If I can do this, how do I then connect to the master hub terminal to issue RPCs to this program?

Sorry if this doesn’t make sense, this Kubernetes is all quite new to me still