I … there/at it/about it
J'y ai vu l'occasion d'en finir définitivement.
I saw it as an opportunity to put an end to it once and for all.
— L'Accusé (2017)
Pourquoi j'y ai pas pensé plus tôt ?
Why didn't I think of that sooner?
— Harry Potter à l'école des sorciers (2001)
J'y ai travaillé pendant les vacances scolaires.
I worked there during the school holidays.