Configuration Problem with yaml based HomeKit Bridge

Configuration
1

I am successfully using a home assistant configuration with distributed files so that my configuration.yaml looks like this:

---
# Configure a default setup of Home Assistant (frontend, api, etc)
default_config:
homeassistant:
  allowlist_external_dirs:
    - /share
  # Load packages
  packages: !include_dir_named integrations
  customize: !include customize.yaml

somehow I cannot get the yaml based HomeKit bridge configuration to work.
when I create a homekit.yaml file in the integrations directory with the content

homekit:

I get an error message after restart

Invalid config
The following integrations and platforms could not be set up:

homekit
Please check your config.

So my question is where to add the “homekit:” line to get this to work.