I am not sure if it is possible to get template variables to properly expand in the markup of an add-page macro, but this is what I would like to do. My attempt is below. It does not expand the second or third macros (i.e. the user is not prompted for them when using this template for a new page; only @Subject@ is working.
@{center}{color:blue}*Project @Subject@ Journal Page*{color}{center}
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h2. Subject Description
{color:gray}Enter description{color}
h2. Create New Journal Entry
@{add-page:template=Meeting-Instance-CommonInclude|parent=@self|prefix=
@Prefix@ Journal Entry %page:title% }Click to add new journal entry{add-page}
@{add-page:template=Meeting-Instance-CommonInclude|parent=@self|prefix=
Journal Entry %page:title% }Click to add new journal entry{add-page}
h2. Journal Entries
{children:depth=1}