if I’m understanding your question correct, you are trying to use tls on containers that may not have tls libraries?
there are two ways to that. one is to rebuild every container by yourself modifying its services to contain tls. the other is to use a pod. you put your service container and a reverse proxy into the same pod, setup that reverse proxy correctly as an edge proxy terminating tls, and expose only the reverse proxy’s port. that way, it will just look like a service with tls enabled.
since you are considering tls for everyone, I assume that you don’t care about overheads. adding a reverse proxy in front of every container is like 10-50MB of additional memory, and it won’t matter on modern systems.