[4] Helleson's rights along with a 2023 second-round draft pick were traded by the Avalanche to the Anaheim Ducks, in exchange for defenseman Josh Manson, on March 14, 2022.

[6] He was assigned to the Ducks American Hockey League (AHL) affiliate, the San Diego Gulls for the remainder of the season.

[14] He made his NHL season debut on November 15, marking his first multi-point game, assisting on goals by Cutter Gauthier and Ross Johnston in a 6–4 win over the Detroit Red Wings.

[15] Helleson represented the United States at the 2019 IIHF World U18 Championships, where he recorded three assists in seven games and won a bronze medal.

[16] He represented the United States at the 2021 World Junior Ice Hockey Championships where he recorded two goals and two assists in seven games and won a gold medal.