Can Referring attributes in same file with some relation be done?

[reshmithaa]

I was able to ref to a attribute by giving the type as same_as.
eg.

      "user_id": {
          "type": "same_as",
          "ref": "sample.content.cust_id"
      }

but when I have a condition like attribute a>b (a,b belongs to same table)
I tried giving

        "a": {
            "type": "number",
            "subtype": "f64",
            "range":{
                "low":{
                    "type": "same_as",
                    "ref": "sample_format.content.b"
                }
            }
        },
        "b": {
            "type": "number",
            "subtype": "f64",
            "range": {
                "low": 0,
                "high": 100
            }
        }

but this doesn't work

Is there any other alternative way to relate attributes like,
a < b
a < b + 5
a < b + c