substitute doc string in scenario outline

I wanna do subsititute doc string :pencil: something like example below(from [Substitution in Scenario Outlines](http://cukes.info/step-definitions.html))
``` feature
Scenario Outline: Email confirmation
  Given I have a user account with my name "Jojo Binks"
  When an Admin grants me <Role> rights
  Then I should receive an email with the body:
    """
    Dear Jojo Binks,
    You have been granted <Role> rights.  You are <details>. Please be responsible.
    -The Admins
    """
  Examples:
    |  Role     | details                                         |
    |  Manager  | now able to manage your employee accounts       |
    |  Admin    | able to manage any user account on the system   |
```