Official comment
Yes! Add a "Add to Sequence" element to the Campaign and send the Contacts to the Step Sequence.
For new accounts or Sequences this will work without any other configuration, but since this is an existing Step Sequence there are a few other things you may have to configure.
1. Change the method to add the Contacts to the Sequence. Add them to the Campaign instead.For example, if you have a form that adds the Contact to the Step Sequence do this:
A. Add a Trigger on the Campaign that acts when the form is filled out.
B. Remove the "Add to Sequence" rule on the form itself (in the Settings)
2. Edit the Step Sequence and select "Unsubscribe contact after last step" in the Settings. This will allow the Contact to return to the Campaign Map after they receive all 50 emails.
Now, when a Contact is added to your Campaign they are included in the reporting, and you can click on the number of Contacts who have passed through the "Add to Sequence" element to see them.
Note that step 2 is not required if you created your ONTRAPORT account after June 5, 2017, as all Step Sequences default to "Unsubscribe after last step" for the newer accounts.