Kubernetes Runner services not accessible under regular url from Docker executor

Hey! I have an issue with the CI Kubernetes Runner.

I've registered my runner inside my cluster with the Helm Chart and everything is running fine, except the creation of services. Using my old runners with Docker executor my mongoDB service gets spun up and I can access it at mongodb://mongo/database, but after switching to the Kubernetes Runner my Application inside the test pipeline cannot connect to the service. Adjusting the configuration to use an alias:

services:
  - name: mongo:latest
    alias: mongo

didn't work either and would be very tedious to setup on every single of my repositories. Any ideas on what to change? Thanks! Nicolai