Unable to create dynamic merge statements in a mailing subject line

In the content of a mailing, the creator can insert merge fields, such as [[First_Name]].  This creates dynamic content and will populate the supporter's name.  In the subject line of the mailing, however, the administrator is unable to insert the merge fields.

This functionality was implemented in Sphere 9.4.1.

Environment

 9.3.9.3

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