Jujutsu Kaisen 0 completed its run in Japanese theatres today, and fans will be able to purchase the film on Blu-ray and DVD beginning September 21. According to the official website, the film is 105 minutes long and will be available on Blu-ray with English subtitles.
The following information was already revealed about the jacket:

Gege Akutami created the manga Jujutsu Kaisen, which is presently serialised in Shueisha’s Weekly Shonen Jump magazine. The manga was released on March 5, 2018. The manga is published in English by Viz Media, and there are presently 15 volumes available, with the 16th due out on June 21 of this year. From 2017 to 2018, a prequel manga titled Jujutsu Kaisen 0 was published.
The Jujutsu Kaisen anime adaption by MAPPA released in 2020. The Jujutsu Kaisen 0 film was also animated by the same company. The TV anime’s second season has been scheduled for 2023.
The plot of the Jujutsu Kaisen prequel is described by Viz Media as follows:
Yuta Okkotsu is a worried high school student who has a serious problem: his childhood buddy Rika has turned into a Curse and refuses to leave him alone. Rika’s predicament is seen by Satoru Gojo, a teacher at Jujutsu High, a school where aspiring exorcists study how to resist Curses. Gojo persuades Yuta to join, but will he be able to learn enough in time to face the Curse that haunts him?
Source: Official Twitter