No — Listen to an Announcement is always a single speaker delivering information to a general audience, with no back-and-forth exchange. This is a structural difference from Listen to a Conversation, which always involves two speakers interacting.
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Because there's only one voice, you don't need to track speaker attribution the way you do in conversations — instead, the listening challenge shifts to following a single speaker's structure and picking out the announcement's purpose and key details as they're delivered, typically in a fairly linear, informational format.
Since there's no speaker-tracking needed, focus your attention on the announcement's structure: what's being announced, why, and what action (if any) listeners are expected to take. Announcements are often organized around a clear purpose stated early, followed by supporting details — tracking that structure matters more here than tracking who's speaking.
Drill all four task types, including announcements, under real conditions.