Could you include a link to a reproducer, staged on github, ideally using https://start.spring.io, H2 (or Testcontainers for PostGreSQL, etc.), that demonstrates the feature you are looking?

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@gregturn
Here is the reproducer: https://github.com/mwyrembl/spring-data-rest-2240
If you start the project and request the resource:
http://localhost:8080/cs/1_1
you get:

{
  "d": {},
  "_links": {
    "self": {
      "href": "http://localhost:8080/cs/1_1"
    },
    "c": {
      "href": "http://localhost:8080/cs/1_1"
    }
  }
}

my question is if it is also possible to include links to A and B from the CId class like this without adding many-to-one relations in C class directly:

{
  "d": {},
  "a": {},
  "b": {},
  "_links": {
    "self": {
      "href": "http://localhost:8080/cs/1_1"
    },
    "c": {
      "href": "http://localhost:8080/cs/1_1"
    }
  }
}