[Feat]: Documenting values not explicitly present in values.yaml file

[Cavaler]

I am looking for a way to document some Helm chart values which are not actually written down in the values.yaml.

Here is a piece of the current values.yaml:

# -- One and only one should be configured
input: 
  # -- TCP connection
  tcp: {}
  # -- UDP connection
  udp: {}
  # -- Serial connection
  serial: {}

If for example input.tcp is not empty, then it is used as an input - with expected fields like host and port inside.
But I cannot document those fields now, since I have to include them in the map.

I'd like to be able to write something like this:

# -- One and only one should be configured
input: 
  # input.tcp.host -- (string) TCP host
  # input.tcp.port -- (int) TCP port
  tcp: {}

But currently these comments are just ignored.