Dont understand how to expose a TCP (6379) non http/s port

Running OKD 4.16 - with Service Mesh. it has routes and Gateways and Virtual Services. No idea how to expose non http TCP ports (any but 80/443/8080 - like 6379 or other binary protocols via the "Routes" or with the "istio" mesh via gw/vs. I understand node ports - but I need this on the "route" where the 80/443 ingress traffic is. Any pointers appreciated.