Ability to trigger event for non-subscriber

I'm looking at the docs for trigger event https://docs.novu.co/api/trigger-event/ and the body parameters state that the "to" property can be an object with firstName, lastName and email. When I try to use that payload for the "to" to trigger the event I get the following error:

"subscriberId under property to is not configured, please make sure all the subscriber contains subscriberId property"

That message seems to be at odds with the docs. Is it only possible to trigger notifications to subscribers?
Trigger event is the main (and the only) way to send notification to subscribers.
The trigger identifier is used to match the particular template associated with it.
Additional information can be passed according the body interface below.
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