Allow metadata and other substitutions in the message body and subject lines of the Assign a Task and Send a Notification outcomes. We would like to be able to customize message body and subject lines with one or more metadata items. As an example, if we have a workflow that is being run for each of several subject people (think onboarding a group of new employees), the tasks will be assigned to the same user for multiple people. We'd like to add name of target employee in the subject line or body of the outcomes.