Is there a way to raise an error which mentions the name of additional key present in JSON if I am using the if-else condition of JSON Schema?

Question

I have a use case where I want to check the keys present in JSON, depending on the value of a different key.

Example JSON-1:

{ 
  "key_name" : "value1",
  "foo" : "random_value1"
}

Example JSON-2:

{ 
  "key_name" : "value2",
  "bar" : "random_value2"
}

There are 2 rules here:

Rule 1. If the value of "key_name" is "value1" then only "foo" key should be present in JSON.

Rule 2. If the value of "key_name" is "value2", then only "bar" key should be present in JSON.

Now, as per the rules, the following JSON's are invalid, and should raise an error.

{ 
  "key_name" : "value1",
  "foo" : "random_value1",
  "bar" : "random_value2"
}

OR

{ 
  "key_name" : "value2",
  "bar" : "random_value2",
  "foo" : "random_value"
}

I have written the JSON Schema for validating these JSON as per this question.

But if I use this, I get the following error:

JSON is not valid under any of the given schemas.

While this solves the purpose, this error is not exactly explainable on why the JSON is not valid. I am expecting some error like:

"Additional properties are not allowed ('bar' was unexpected)"

This is the default error whenever any additional key is present

How to go about doing it?