I also need this

although I don't know much about it, I don't know whether to provide a general idea

var r = {};
r[role] =  roleValue;
console.log(r.0);

We used rap2 to manage instead of messing with Mock.js directly.
then, you can directly set roleValue to type "function", and then set its "initial value" to something similar to the following code:

function() { 
  return (this.role === 0 ? '' : '');
}

you can see that inside the function, this can correspond to other key of the current simulation.
I hope I can help you.

you can't map in comments, but you can do this in rap2:

let roleVals=['','']

roleValue=roleVals[role]

I've been using json-server + mock. You can use dependency functions to write this

{  
  // 
  'role': '@PICK([0, 1])',
  'roleValue': function() {
    // role
    let role = this.role
    return role === 0 ? '': ''
  }
}