As you surmised, Jok, it's a prepositional phrase that is placed after whatever it modifies. For instance 'The man
in the moon'
[
captain.park.edu]
[
www.usingenglish.com]
At primary school we were introduced to prepositions with the jingle:
A preposition
shows position
placed
before a noun.
(That was a long time ago. I don’t think ‘grammar schools’ regard it as their function to teach grammar nowadays!)
But in common usage prepositions can often be placed after whatever they modify. Some amusing stuff about that here:
[
en.wikipedia.org]
No less so with prepositional phrases.