can I have unconstrained String as record element?

Can I do what I asked, I suspect not, so Im thinking along the lines:

type my_record_type is
  record
    name    : string(1 to 20);
    ....
  end record my_record;

Basically, I want to be able to give the record name a constant string
when it is delcared like:

CONSTANT my_record : my_record_type := ( name => "Betty Swollocks",
--length only 15, complains unless I pad to 20 chars.
                                                                     
.......)

Or am I just going to have to pad the name with whitespace to make it
up to name'length?