Here are student examples of ‘just’ pre-modifying a prepositional phrase.
TLC, speaking test, female China B1
PELIC, female Arabic level 4 writing class.
In the English Grammar Profile, A2 point 3 in the category of PREPOSITIONS is defined:
‘JUST’ + to modify prepositions.
An iWeb search for:
1 JUST LIKE 495187
2 JUST IN 139921
3 JUST BEFORE 128761
4 JUST BY 84874
Here are the rest of the prepositions after ‘just’ in order of frequency and tagged by CEFR level: