How to access class or record field with the name of the field as a string?

Say you have a record or class:

record R {
  var value: int;
}

How can I access the field value by using the string "value"?

For example, in Python, you can access fields using the getattr built-in:

class C:
    def __init__(self, val):
        self.value = val

c = C(2)

print(getattr(c, 'value')) # prints 2

What would this look like in Chapel?