[1] Bratt was expected to be loaned by the Devils to the London Knights of the Ontario Hockey League (OHL), who owned his North American junior rights after selecting him in the 2017 CHL Import Draft.

[3] Bratt scored two points in his first NHL game, a power play goal and a shorthanded assist in a 4–1 victory over the Colorado Avalanche.

[2] Bratt had 10 goals and 30 points by the All-Star break, having spent much of the first half of the season playing alongside Taylor Hall and Nico Hischier on the Devils' first line; however, the Devils' trade deadline acquisition of Patrick Maroon from the Edmonton Oilers led to a decrease in opportunities for Bratt, who scored only one goal following the All-Star break.

[11] He was named to the 2024 NHL All-Star Game in January 2024, following an injury to would-be attending teammate Jack Hughes.

[13] He was named to play for Sweden's team in the NHL 4 Nations Face-Off tournament, which is scheduled to take place on 12–20 February 2025.